0001438533-24-000031 | 10-Q | XBRL Viewer

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NET LOSS PER COMMON SHARE - Additional Information (Details) - Underwritten Equity Offering	Feb. 28, 2023 $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Sales price per share (in dollars per share)	$ 21.00
Common Stock
Subsidiary, Sale of Stock [Line Items]
Pre-funded warrants exercisable for share of common stock (in shares) \| shares	1
Pre Funded Warrant
Subsidiary, Sale of Stock [Line Items]
Number of securities called by warrants or rights (in shares) \| shares	1,250,000
Sales price per share (in dollars per share)	$ 20.9999
Exercise price of each pre-funded warrant (in dollars per share)	$ 0.0001

BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The unaudited consolidated financial statements represent the consolidation of the accounts of the Company, its subsidiaries and variable interest entities for which the Company has been determined to be the primary beneficiary, in conformity with accounting principles generally accepted in the United States ("U.S. GAAP"). All intercompany accounts and transactions have been eliminated in consolidation. See Note 6 for further discussion of variable interest entities (“VIE”) that the Company consolidates.
Revenue Recognition	Revenue Recognition The Company recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers ("ASC 606"), the entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The Company only recognizes revenue from contracts when it is probable that the entity will collect substantially all the consideration it is entitled to in exchange for the goods or services it transfers to the customer. Deductions from Revenue Revenues from product sales are recorded at the net sales price, which includes provisions resulting from discounts, rebates and co-pay assistance that are offered to customers, payers and other indirect customers relating to the Company’s sales of its products. These provisions are based on the estimates of the amounts earned or to be claimed on the related sales. These amounts are treated as variable consideration, estimated and recognized as a reduction of the transaction price at the time of the sale, using the most likely amount method, and are classified as a reduction of accounts receivable (if the amount is payable to a customer) or as a current liability (if the amount is payable to a party other than a customer). The Company includes these estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized for such transactions will not occur. Where appropriate, these reserves take into consideration the Company’s historical experience, current contractual and statutory requirements and specific known market events and trends. Overall, these reserves reflect the Company’s best estimates of the amount of consideration to which it is entitled based on the terms of the contract. If actual results in the future vary from the Company’s provisions, the Company will adjust the estimate, which would affect net product revenue and earnings in the period such variances become known. For the six months ended June 30, 2024 and 2023, adjustments to net product revenue related to performance obligations satisfied in previous periods were immaterial. Government Rebates: The Company calculates the rebates that it will be obligated to provide to government programs and deducts these estimated amounts from its gross product sales at the time the revenues are recognized. Allowances for government rebates and discounts are established based on an estimated allocation of payers and the government-mandated discounts applicable to government-funded programs. Rebate discounts are included in accrued expenses in the accompanying Consolidated Balance Sheets. Commercial Rebates: The Company calculates the rebates it incurs according to any contracts with certain commercial payers and deducts these amounts from its gross product sales at the time the revenues are recognized. Allowances for commercial rebates are established based on actual payer information, which is reasonably estimated at the time of delivery for applicable products. Rebate discounts are included in accrued expenses in the accompanying Consolidated Balance Sheets. Prompt Pay Discounts: The Company offers discounts to certain customers for prompt payments. The Company accrues for the calculated prompt pay discount based on the gross amount of each invoice for those customers at the time of sale. Product Returns: Consistent with industry practice, the Company offers its customers a limited right to return product purchased directly from the Company, which is principally based upon the product’s expiration date. Historically, returns have been immaterial. Co-pay Assistance: The Company offers a co-pay assistance program, which is intended to provide financial assistance to qualified commercially insured patients with prescription drug co-payments required by payers. The calculation of the accrual for co-pay assistance is based on an estimate of claims and the estimated cost per claim associated with product that has been recognized as revenue.
Collaborative Arrangements	Payments received under collaboration and licensing agreements may include non-refundable fees at the inception of the arrangements, milestone payments for specific achievements and royalties on the sale of products. At the inception of arrangements that include milestone payments, the Company uses judgment to evaluate whether the milestones are probable of being achieved and estimates the amount to include in the transaction price utilizing the most likely amount method. If it is probable that a significant revenue reversal will not occur, the estimated amount is included in the transaction price. Milestone payments that are not within the Company or the licensee’s control, such as regulatory approvals, are considered to be constrained due to a high degree of uncertainty and are not included in the transaction price until such uncertainty is resolved. At the end of each reporting period, the Company re-evaluates the probability of achievement of development milestones and any related constraint and adjusts the estimate of the overall transaction price, if necessary. The Company recognizes aggregate sales-based milestones and royalty payments from product sales of which the license is deemed to be the predominant item to which the royalties relate, at the later of when the related sales occur or when the performance obligation to which the sales-based milestone or royalty has been allocated has been satisfied. Revenue from collaboration and licensing agreements may also include sales of inventory, at cost plus a margin, which is recorded in license and collaboration revenue. The Company utilizes significant judgment to develop estimates of the stand-alone selling price for each distinct performance obligation based upon the relative stand-alone selling price. Variable consideration that relates specifically to the Company’s efforts to satisfy specific performance obligations is allocated entirely to those performance obligations. The stand-alone selling price for license-related performance obligations requires judgment in developing assumptions to project probability-weighted cash flows based upon estimates of forecasted revenues, clinical and regulatory timelines and discount rates. The stand-alone selling price for clinical development performance obligations is based on forecasted expected costs of satisfying a performance obligation plus an appropriate margin. If the licenses to intellectual property are determined to be distinct from the other performance obligations identified in the arrangement and have stand-alone functionality, the Company recognizes revenues from non-refundable, upfront fees allocated to the license when the license is transferred to the licensee and the licensee is able to benefit from the license. For licenses that are not distinct from other promises, the Company applies judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the related revenue recognition accordingly. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the products or services to be provided. Revenue is recorded proportionally as costs are incurred. The Company generally utilizes the cost-to-cost method of progress because it best measures the transfer of control to the customer which occurs as the Company incurs costs. Under the cost-to-cost measure of progress, the extent of progress towards completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. The Company uses judgment to estimate the total costs expected to complete the clinical development performance obligations, which include subcontractor costs, labor, materials, other direct costs and an allocation of indirect costs. The Company evaluates these cost estimates and the progress each reporting period and adjusts the measure of progress, if necessary.
Cost of goods sold	Cost of goods sold Cost of goods sold includes the cost of inventory sold, third party manufacturing and supply chain costs, product shipping and handling costs, and provisions for excess and obsolete inventory. Cost of goods sold also includes the cost of goods sold under the Company's license and collaboration agreements, which currently consists of the sale of active pharmaceutical ingredients to the Company's collaboration partners, at cost or at cost plus a margin.
Capitalization of Inventory Costs	Capitalization of Inventory Costs Prior to the regulatory approval of the Company's drug candidates, the Company incurs expenses for the manufacture of drug product supplies to support clinical development that could potentially be available to support the commercial launch of those drugs. The Company capitalizes inventory costs associated with its products after regulatory approval, when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized. Until the date at which regulatory approval has been received, costs related to the production of inventory are recorded as research and development expenses as incurred. Any eventual sale of previously expensed ("zero-cost") inventories may impact future margins, for any periods in which those inventories are sold. Prior to the February 2023 FDA accelerated approval of FILSPARI (sparsentan), the Company expensed the production of active pharmaceutical ingredients purchased to support the commercial launch of FILSPARI, in research and development expenses. For the three and six months ended June 30, 2024 and 2023, sales of FILSPARI primarily consisted of zero-cost inventories. As of June 30, 2024, the Company had approximately $3.5 million of zero-cost inventory. The Company expects to continue to record zero cost of goods sold on the sale of previously expensed inventories through at least 2025. The Company began capitalizing inventory costs associated with FILSPARI following the February 2023 accelerated approval.
Research and Development Expenses	Research and Development Expenses Research and development includes expenses related to sparsentan, pegtibatinase, and the Company's other pipeline programs. The Company expenses all research and development costs as they are incurred. The Company's research and development costs are composed of salaries and bonuses, benefits, share-based compensation, license fees, milestones under license agreements, costs paid to third-party contractors to perform research, conduct clinical trials, costs to develop drug materials and delivery devices, costs to manufacture drug product supplies to support clinical development, and associated overhead expenses and facilities costs. The Company charges direct internal and external program costs to the respective development programs. The Company also incurs indirect costs that are not allocated to specific programs because such costs benefit multiple development programs and allow us to increase our pharmaceutical development capabilities. These consist of internal shared resources related to the development and maintenance of systems and processes applicable to all of our programs. Nonrefundable advance payments for goods and services to be received in the future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related goods are delivered or the services are performed, or when it is no longer expected that the goods will be delivered or the services rendered.
Clinical Trial Expenses	Clinical Trial Expenses The Company records expenses in connection with its clinical trials under contracts with contract research organizations ("CROs") that support conducting and managing clinical trials, as well as contract manufacturing organizations ("CMOs") for the manufacture of drug product supplies to support clinical development. The financial terms and activities of these agreements vary from contract to contract and may result in uneven expense levels. Generally, these agreements set forth activities that drive the recording of expenses such as start-up, initiation activities, enrollment, treatment of patients, or the completion of other clinical trial activities, and in the case of CMOs, costs associated with the production of drug product supplied and the procurement of raw materials to be consumed in the manufacturing process. Expenses related to clinical trials are accrued based on our estimates of the progress of services performed, including actual level of patient enrollment, completion of patient studies and progress of the clinical trials or the delivery of goods. Other incidental costs related to patient enrollment or treatment are accrued when reasonably certain. If the amounts we are obligated to pay under our clinical trial agreements are modified (for instance, as a result of changes in the clinical trial protocol or scope of work to be performed), the Company adjusts its estimates accordingly on a prospective basis. Revisions to the Company's contractual payment obligations are charged to expense in the period in which the facts that give rise to the revision become reasonably certain. The Company currently has one Phase 1/2 clinical trial, two Phase 2 clinical trials and three Phase 3 clinical trials in process that are in varying stages of activity, with ongoing non-clinical support trials. As such, clinical trial expenses will vary depending on all the factors set forth above and may fluctuate significantly from quarter to quarter.
Intangible Assets with Cost Accumulation Model	Intangible Assets with Cost Accumulation Model In 2014, the Company entered into a license agreement with Mission Pharmacal in which the Company obtained the exclusive right to license the trademark of Thiola. The acquisition of the Thiola license qualified as an asset acquisition under the principles of ASC 805, Business Combinations ("ASC 805") in effect at the time of acquisition. The license agreement requires the Company to make royalty payments based on net sales of Thiola. The liability for royalties in excess of the annual contractual minimum is recognized in the period in which the royalties become probable and estimable, which is typically in the period corresponding with the respective sales. The Company records an offsetting increase to the cost basis of the asset under the cost accumulation model ("Thiola Intangible"). The additional cost basis is subsequently amortized over the remaining useful life. In the second quarter of 2023, the Company reduced the estimated useful life of the Thiola Intangible to better reflect the pattern of projected future cash flows. The change in estimated useful life was accounted for as a change in accounting estimate with the remaining carrying amounts of the Thiola Intangible being amortized prospectively over the new useful life. Consistent with all prior periods since Thiola was acquired, the Company has not accrued any liability for future royalties in excess of the annual contractual minimum at June 30, 2024 as such royalties are not yet probable and estimable.
Variable Interest Entity	Variable Interest Entity The Company reviews each investment and collaboration agreement to determine if it has a variable interest in the entity. In assessing whether the Company has a variable interest in the entity as a whole, the Company considers and makes judgments regarding the purpose and design of the entity, the value of the licensed assets to the entity, the value of the entity’s total assets and the significant activities of the entity. If the Company has a variable interest in the entity as a whole, the Company assesses whether or not the Company is a primary beneficiary of that VIE, based on a number of factors, including: (i) which party has the power to direct the activities that most significantly affect the VIE’s economic performance, (ii) the parties’ contractual rights and responsibilities pursuant to the collaboration agreement, and (iii) which party has the obligation to absorb losses of or the right to receive benefits from the VIE that could be significant to the VIE. If the Company determines that it is the primary beneficiary of a VIE at the onset of the collaboration, the collaboration is treated as a business combination and the Company consolidates the financial statements of the VIE into the Company’s consolidated financial statements. On a quarterly basis, the Company evaluates whether it continues to be the primary beneficiary of the consolidated VIE. If the Company determines that it is no longer the primary beneficiary of a consolidated VIE, it deconsolidates the VIE in the period in which the determination is made. Assets and liabilities recorded as a result of consolidating the financial results of the VIE into the Company’s consolidated balance sheet do not represent additional assets that could be used to satisfy claims against the Company’s general assets or liabilities for which creditors have recourse to the Company’s general assets.
Equity Securities	Equity Securities The Company applies the equity method of accounting for investments when it has significant influence, but no controlling interest in the investee. Judgment regarding the level of influence over each equity method investment includes key factors such as ownership interest, representation on the board of directors, participation in joint steering committees and material intercompany transactions. The Company evaluates any basis difference between the carrying value and fair value of the Company's proportionate share of the investee's net assets. Basis differences relating to in-process research and development (IPR&D) are expensed when the investee is not considered a business as defined in ASC 805, Business Combinations, due to substantially all of the estimated fair value of the gross assets being concentrated in a group of similar IPR&D assets with no alternative future use. For the three and six months ending June 30, 2024, the Company recognized $3.4 million in other expense in the Company's consolidated statements of operations for these basis adjustments. The equity method investment's carrying value was reduced to zero as the Company's proportionate share of the basis difference exceeded the carrying value. See Note 6 for further discussion. Investments accounted for using the equity method may be reported on a lag of up to three months if the financial statements of the investee are not available in sufficient time for the Company to apply the equity method as of the current reporting date.
Discontinued Operations	Discontinued Operations Discontinued operations is presented when there is a disposal of a component or a group of components that in the Company's judgment represents a strategic shift that will have a major effect on the Company's operations and financial results. Results of operations directly related to discontinued operations are aggregated into a single line item in the Consolidated Statements of Operations for all periods presented.
Restructuring	Restructuring Restructuring charges consist primarily of employee severance, one-time termination benefits related to the reduction of its workforce, and other costs. Liabilities for costs associated with a restructuring activity are recognized when the liability is incurred and are measured at fair value. One-time termination benefits are expensed at the date the entity notifies the employee, unless the employee must provide future service, in which case the benefits are expensed ratably over the service period. Termination benefits are calculated based on regional benefit practices and local statutory requirements. In December 2023, the Company initiated a restructuring plan that resulted in a reduction of its workforce, primarily impacting non-field-based employees. One-time termination benefits include severance, continuation of health insurance coverage, and other benefits for a specified period of time. The Company estimated that it will incur a total of $12.0 million to $14.0 million in non-recurring charges in connection with the restructuring, of which the Company has recognized a total of $12.3 million as of June 30, 2024, including $0.7 million and $0.9 million for the three and six months ended June 30, 2024, respectively. As of June 30, 2024 and December 31, 2023, the Company had accruals related to the restructuring of $1.1 million and $11.4 million, respectively, which is included in accrued expenses in the Consolidated Balance Sheets. Cash payments totaling $11.3 million were made related to the restructuring during 2024. The Company expects that it will incur the remaining estimated restructuring costs during 2024. The Company anticipates it will pay all restructuring plan amounts during 2024.
Recently Adopted and Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In November 2023, the FASB issued ASU No. 2023-07, Improvements to Reportable Segment Disclosure. The FASB amended the guidance in ASC 280, Segment Reporting ("ASC 280"), to require a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment's profit or loss and assets that are currently required annually. Public entities with a single reportable segment are required to provide the new disclosures and all the disclosures required under ASC 280. The guidance is applied retrospectively to all periods presented in financial statements, unless it is impracticable. This new guidance is effective for public business entities for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company adopted this new standard as of January 1, 2024, however, the adoption did not have an impact on the accompanying quarterly financial statements since the standard is not effective for interim periods until fiscal 2025. While this accounting standard will increase disclosures, it will not have a material impact on the Company's financial statements. Recently Issued Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board ("FASB") or other standard setting bodies. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its consolidated financial position or results of operations upon adoption. In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures. This new standard does not change accounting for income taxes but requires new disclosures focusing on two areas, the effective rate reconciliation and taxes paid. This new standard is effective for public business entities for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company expects to adopt this new standard beginning in fiscal 2025 when it becomes effective.
Net Loss Per Common Share	Basic and diluted net income (loss) per common share is calculated by dividing net loss applicable to common stockholders by the weighted-average number of common shares outstanding during the period. In accordance with ASC 260, Earnings per Share, if a company had a discontinued operation, the company uses income from continuing operations, adjusted for preferred dividend and similar adjustments, as its control number to determine whether potential common shares are dilutive. As discussed in Note 17, as part of its February 2023 underwritten public offering, the Company issued and sold pre-funded warrants to purchase 1.25 million shares of its common stock at a price to the public of $20.9999 per pre-funded warrant. The pre-funded warrants are exercisable immediately and are exercisable for one share of the Company's common stock. The exercise price of each pre-funded warrant is $0.0001 per share of common stock. Since the $0.0001 price per share represents little consideration and is non-substantive in relation to the $20.9999 price per pre-funded warrant and the $21.00 price per share of the common stock offered to the public, and as the warrants are immediately exercisable with no further vesting conditions or contingencies associated with them, the shares underlying the warrants are therefore included in the calculation of basic net loss per common share. The Company’s potentially dilutive shares, which include outstanding stock options, restricted stock units, and shares issuable upon conversion of the 2025 Notes and 2029 Notes, are considered to be common stock equivalents and are not included in the calculation of diluted net loss per share because their effect is anti-dilutive.
Fair Value Measurements	The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 – Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. The valuation techniques used to measure the fair value of the Company’s debt securities and all other financial instruments, all of which have counter-parties with high credit ratings, were valued based on quoted market prices or model driven valuations using significant inputs derived from or corroborated by observable market data. Based on the fair value hierarchy, the Company classified marketable debt securities within Level 2.

COLLABORATION AND LICENSE AGREEMENTS	6 Months Ended
COLLABORATION AND LICENSE AGREEMENTS	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
COLLABORATION AND LICENSE AGREEMENTS	COLLABORATION AND LICENSE AGREEMENTS License Agreement with CSL Vifor On September 15, 2021, the Company entered into a license and collaboration agreement (“CSL Vifor License Agreement”) with Vifor (International) Ltd. (“CSL Vifor”), pursuant to which the Company granted an exclusive license to CSL Vifor for the commercialization of sparsentan in Europe, Australia and New Zealand ("CSL Vifor Licensed Territories"). CSL Vifor also has first right of negotiation to expand the licensed territories into Canada, China, Brazil and/ or Mexico. Under the terms of the CSL Vifor License Agreement, the Company received an upfront payment of $55.0 million and will be eligible for up to $135.0 million in aggregate regulatory and market access related milestone payments and up to $655.0 million in aggregate sales-based milestone payments for a total potential value of up to $845.0 million. The Company is also entitled to receive tiered double-digit royalties up to 40 percent of annual net sales of sparsentan in the CSL Vifor Licensed Territories. Under the CSL Vifor License Agreement, CSL Vifor will be responsible for all commercialization activities in the CSL Vifor Licensed Territories. The Company remains responsible for the worldwide clinical development of sparsentan through regulatory approval as defined and will retain all rights to sparsentan in the United States and rest of world outside of the CSL Vifor Licensed Territories. Development costs for any post regulatory approval development activities, subject to approval by both parties, will be borne by the Company and CSL Vifor as defined, respectively. The CSL Vifor License Agreement will remain in effect, unless terminated earlier, until the expiration of all royalty terms for sparsentan in the licensed territories. Each party has the right to terminate the CSL Vifor License Agreement for the other party’s uncured material breach, insolvency or if the time required for performance under the CSL Vifor License Agreement by the other party is extended due to a force majeure event that continues for six months or more. The Company assessed the CSL Vifor License Agreement and determined that it meets both criteria to be considered a collaborative agreement within the Scope of ASC 808, Collaborative Arrangements ("ASC 808") of active participation by both parties and exposures to significant risks and rewards dependent on the commercial success of the activities. Both parties participate on joint steering and other committees overseeing the collaboration activities. Also, both parties are exposed to significant risks and rewards based on the economic outcomes of regulatory approvals and commercialization of sparsentan. The Company determined the transaction price under the CSL Vifor License Agreement totaled $55.0 million, consisting of the fixed non-refundable upfront payment. The variable regulatory and access related milestones were excluded from the transaction price given the substantial uncertainty related to their achievement. Sales-based milestone payments and royalties on net sales were excluded from the transaction price and will be recognized at the later of when the related sales occur or when the performance obligation to which the sales-based milestone or royalty has been allocated have been satisfied. The Company concluded that CSL Vifor represented a customer and applied relevant guidance from ASC 606 to evaluate the accounting under the CSL Vifor License Agreement. In accordance with this guidance, the Company concluded that the promise to grant the license is distinct from the promise to provide clinical development services resulting in two performance obligations. As a result, the Company allocated $12.0 million of the transaction price, based on the performance obligations' relative standalone selling prices, to the license, which was recognized in full in 2021. The remaining $43.0 million of the transaction price was allocated to the clinical development activities and recorded as deferred revenue, which will be recognized over the development period based upon the ratio of costs incurred to date to the total estimated costs. For the three and six months ended June 30, 2024, the Company recognized $1.9 million and $3.3 million, respectively, in license and collaboration revenue for clinical development activities, based upon the ratio of costs incurred to total estimated costs. For the three and six months ended June 30, 2023, the Company recognized $2.7 million and $9.4 million, respectively, in license and collaboration revenue for clinical development activities, based upon the ratio of costs incurred to total estimated costs. Deferred revenue related to the clinical development activities as of June 30, 2024 was $5.4 million, with the total amount classified as current based upon amounts expected to be realized within the next year. As of December 31, 2023, deferred revenue related to the clinical development activities was $8.9 million, of which $7.1 million was classified as current. The Company estimates that the remainder of the deferred revenue balance will be fully realized by mid-2025. Licensing Agreement with Renalys In January 2024, the license agreement (“Renalys License Agreement”) between the Company and Renalys Pharma, Inc. (“Renalys”) came into effect. Pursuant to the terms of the Renalys License Agreement, the Company granted an exclusive license to Renalys for the development and commercialization of sparsentan in Japan, South Korea, Taiwan and other specified Asian countries ("Renalys Licensed Territories"). Under the terms of the Renalys License Agreement, the Company received a non-refundable upfront payment and will be eligible to receive up to $120.0 million in aggregate development and sales-based milestones. The Company is also entitled to receive tiered double-digit to mid-20 percent royalties of annual net sales of sparsentan in the Renalys Licensed Territories. In addition, the Company received an option to purchase shares of common stock of Renalys (“Option Agreement”), which it exercised in January 2024. The Company has the option to purchase all equity securities of Renalys at any time prior to the top-line results of the Phase 3 trial in Japan (“Buyout Right”). Under the Renalys License Agreement, Renalys will be responsible for all development and commercialization activities in the Renalys Licensed Territories. The Renalys License Agreement will remain in effect, unless terminated earlier, until the expiration of all royalty terms for sparsentan in the Renalys Licensed Territories. Each party has the right to terminate the Renalys License Agreement for the other party’s uncured material breach or insolvency, or if the time required for performance under the Renalys License Agreement by the other party is extended due to a force majeure event that continues for nine months or more. Renalys may terminate the Renalys License Agreement for any reason upon prior written notice to the Company. The Company may terminate the Renalys License Agreement if Renalys abandons development in Japan or South Korea prior to first commercial sales of sparsentan in either Japan or South Korea. The Company assessed the Renalys License Agreement and determined that it meets both criteria to be considered a collaborative agreement within the Scope of ASC 808, Collaborative Arrangements of active participation by both parties and exposures to significant risks and rewards dependent on the commercial success of the activities. Both parties participate on a joint steering committee overseeing the development and commercial activities. Also, both parties are exposed to significant risks and rewards based on the economic outcomes of regulatory approvals and commercialization of sparsentan. The Company determined the transaction price under the Renalys License Agreement totaled $8.3 million, consisting of the fixed non-refundable upfront payment, milestone payment and estimated fair value of the Option Agreement. The variable development-related milestones were excluded from the transaction price given the substantial uncertainty related to their achievement. Sales-based milestone payments and royalties on net sales were excluded from the transaction price and will be recognized at the later of when the related sales occur or when the performance obligation to which the sales-based milestone or royalty has been allocated has been satisfied. The Company concluded that Renalys represents a customer and applied relevant guidance from ASC 606 to evaluate the accounting under the Renalys License Agreement. In accordance with this guidance, the Company concluded that the promise to grant the license is distinct, resulting in one performance obligation as the license has stand-alone functionally at contract inception. The Buyout Right precludes transferring control of the license to Renalys under ASC 606 and the Company’s option to repurchase the common stock at a price greater than the original license premium results in accounting for the Renalys License Agreement as a financing arrangement. The transaction price was recorded in other non-current liabilities, and will be recognized in revenue upon exercise or termination of the Buyout Right. See Note 6 for further discussion of VIE’s.

INTANGIBLE ASSETS - Summary of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 9,897	$ 10,387	$ 19,249	$ 16,449
Research and development
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	0	2,420	0	4,814
Selling, general and administrative
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 9,897	$ 7,967	$ 19,249	$ 11,635

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cover - shares	6 Months Ended
Cover - shares	Jun. 30, 2024	Jul. 29, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	001-36257
Entity Registrant Name	TRAVERE THERAPEUTICS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-4842691
Entity Address, Address Line One	3611 Valley Centre Drive
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92130
City Area Code	888
Local Phone Number	969-7879
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	TVTX
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		76,491,485
Entity Central Index Key	0001438533
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2

BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES - Summary of Cost and Goods Sold (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of goods sold	$ 2,061	$ 1,452	$ 3,565	$ 5,597
Cost of goods sold - product sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of goods sold	1,929	1,445	3,433	2,553
Cost of goods sold - license and collaboration
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of goods sold	$ 132	$ 7	$ 132	$ 3,044

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Reference 82: http://www.xbrl.org/2003/role/disclosureRef
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Reference 83: http://www.xbrl.org/2003/role/disclosureRef
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Reference 84: http://www.xbrl.org/2003/role/disclosureRef
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Reference 85: http://www.xbrl.org/2003/role/disclosureRef
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Reference 86: http://www.xbrl.org/2003/role/disclosureRef
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Reference 87: http://www.xbrl.org/2003/role/disclosureRef
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Reference 88: http://www.xbrl.org/2003/role/disclosureRef
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Reference 89: http://www.xbrl.org/2003/role/disclosureRef
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Reference 90: http://www.xbrl.org/2003/role/disclosureRef
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Reference 92: http://www.xbrl.org/2003/role/disclosureRef
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Reference 93: http://www.xbrl.org/2003/role/disclosureRef
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Reference 94: http://www.xbrl.org/2003/role/disclosureRef
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Reference 95: http://www.xbrl.org/2003/role/disclosureRef
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Reference 96: http://www.xbrl.org/2003/role/disclosureRef
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Reference 97: http://www.xbrl.org/2003/role/disclosureRef
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Reference 98: http://www.xbrl.org/2003/role/disclosureRef
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Reference 99: http://www.xbrl.org/2003/role/disclosureRef
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Reference 100: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

INTANGIBLE ASSETS - Summary of Finite-lived Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived intangible assets	$ 203,017	$ 183,037
Less: accumulated amortization	(98,596)	(79,347)
Net carrying value	$ 104,421	$ 103,690

NET LOSS PER COMMON SHARE - Summary of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Continuing operations, basic (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Continuing operations, diluted (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Discontinued operations, basic (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Discontinued Operations, diluted (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Weighted average common shares outstanding, basic (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Weighted average common shares outstanding, diluted (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Net Income (loss) from continuing operations	$ (69,652)	$ (101,932)	$ (205,610)	$ (198,496)
Net Income (loss) from discontinued operations, net of tax	(757)	16,302	(860)	26,535
Net Income (loss), basic	(70,409)	(85,630)	(206,470)	(171,961)
Net Income (loss), diluted	$ (70,409)	$ (85,630)	$ (206,470)	$ (171,961)
EPS from continuing operations, basic (in dollars per share)	$ (0.90)	$ (1.34)	$ (2.66)	$ (2.75)
EPS from continuing operations, diluted (in dollars per share)	(0.90)	(1.34)	(2.66)	(2.75)
EPS from discontinued operations, basic (in dollars per share)	(0.01)	0.21	(0.01)	0.37
EPS from discontinued operations, diluted (in dollars per share)	(0.01)	0.21	(0.01)	0.37
Net loss per common share, diluted (in dollars per share)	(0.91)	(1.13)	(2.67)	(2.38)
Net loss per common share, basic (in dollars per share)	$ (0.91)	$ (1.13)	$ (2.67)	$ (2.38)

DESCRIPTION OF BUSINESS (Details) - USD ($) $ in Millions	Aug. 31, 2023	Apr. 30, 2024	Sep. 15, 2021
Vifor Pharma \| Collaborative Arrangement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Maximum milestone payments from collaborator			$ 845.0
Regulatory Milestone \| Vifor Pharma \| Collaborative Arrangement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Maximum milestone payments from collaborator		$ 17.5
Disposed of by Sale \| Bile Acid Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 210.0
Consideration receivable on sale of business (up to)	235.0
Disposed of by Sale \| Minimum \| Bile Acid Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Milestone thresholds	125.0
Disposed of by Sale \| Maximum \| Bile Acid Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Milestone thresholds	$ 500.0

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Nov. 30, 2020
Business Acquisition [Line Items]
In-process research and development	$ 65,200	$ 0	$ 0	$ 65,205	$ 0
Orphan Technologies Limited
Business Acquisition [Line Items]
Contingent consideration, liability						$ 427,000

VARIABLE INTEREST ENTITIES	6 Months Ended
VARIABLE INTEREST ENTITIES	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITIES	VARIABLE INTEREST ENTITIES Stock Purchase and Collaboration Agreement with PharmaKrysto In March 2022, the Company entered into a Collaboration Agreement with PharmaKrysto Limited (“PharmaKrysto”), a privately held pre-clinical stage company related to PharmaKrysto's early-stage cystinuria discovery program, and concurrently therewith entered into a Stock Purchase Agreement with PharmaKrysto (together, the "Agreements"). Pursuant to the terms of the Agreements, the Company paid PharmaKrysto's shareholders $0.6 million in cash to purchase 5% of the outstanding common shares of PharmaKrysto and $0.4 million to PharmaKrysto as a one-time signing fee. Under the Collaboration Agreement, the Company will fund all research and development expenses for the pre-clinical activities associated with the cystinuria program, which are estimated to be approximately $5.0 million. The Agreements require the Company to purchase an additional 5% of the outstanding common shares for $1.0 million upon the occurrence of a specified pre-clinical milestone, and grant an option to the Company to purchase all of the remaining outstanding shares of PharmaKrysto for $5.0 million upon the occurrence of a subsequent pre-clinical milestone prior to expiration of the option on March 8, 2025. If the Company elects to exercise the option, it would be required to perform commercially reasonable clinical diligence obligations. In addition, it would be required to make cash milestone payments totaling up to an aggregate $16.0 million upon the achievement of certain development and regulatory milestones, plus tiered royalty payments of less than 4% on future net sales of a product, if approved. The Company has the right to terminate the Agreements and return the shares for a nominal price at any time upon 60 days’ notice, subject to survival of contingent obligations, if any. The Company determined that PharmaKrysto is a VIE because it lacks the resources to conduct the cystinuria clinical program and the limitation on the residual returns through the Company's option to purchase the remaining outstanding shares. The Company further concluded that it is the primary beneficiary of the VIE due to the Company's ultimate control over the research and development program, and its obligation, subject to continuation of the collaboration, to fund 100% of research and development costs of the program pursuant to the terms of the Collaboration Agreement. The upfront payments were expensed to research and development and other income (expense), net upon initial consolidation. The consolidated assets and liabilities as of June 30, 2024 and December 31, 2023 were immaterial. The results of operations were not significant for the three and six months ended June 30, 2024 and 2023. The Company is not required to provide additional funding other than the contractually required amounts disclosed above. The creditors and beneficial holders of PharmaKrysto have no recourse to the general credit or assets of the Company. Licensing Agreement with Renalys In January 2024, the Renalys License Agreement between the Company and Renalys came into effect and the Company exercised its option to purchase shares of common stock of Renalys. The Company determined that Renalys is a VIE as they could require additional funding to support development and commercial activities. The Company has variable interests in Renalys, including an equity interest, Buyout Right and performance-related payments under the Renalys License Agreement that absorb variability from the performance of Renalys. In order to determine the primary beneficiary of Renalys, the Company evaluated its variable interest to identify if the Company had the power to direct the activities that most significantly impact the economic performance. Based upon the capital structure, governing documents and overall business operations, the Company determined that it is not the primary beneficiary as it does do not have the power to direct the activities that most significantly impact the economic performance of Renalys and does not have an obligation to absorb losses. As of June 30, 2024, the carrying amount of the liabilities related to the Company’s variable interests was $8.3 million, recorded in other non-current liabilities in the Company’s Consolidated Balance Sheets. The Company’s maximum exposure to loss as of June 30, 2024 is zero. The Company is not required to provide additional funding. The creditors have no recourse to the general credit or assets of the Company.

ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Receivables [Abstract]
Accounts receivable, net	$ 24,466	$ 21,179

INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

Ligand License Agreement

In 2012, the Company entered into an agreement with Ligand Pharmaceuticals, Inc. ("Ligand") for a worldwide sublicense to develop, manufacture and commercialize sparsentan (the “Ligand License Agreement”). As consideration for the license, the Company is required to make substantial payments upon the achievement of certain milestones, totaling up to $114.1 million. Through June 30, 2024 the Company has capitalized $47.2 million for contractual milestones achieved under the Ligand License Agreement, including $5.8 million for the three and six months ended June 30, 2024. Pursuant to the Ligand License Agreement, the Company is obligated to pay to Ligand (and Bristol-Myers Squibb Company ("BMS")) an escalating royalty between 15% and 17% of net sales of sparsentan, with payments due quarterly. The Company began incurring costs associated with such royalties following the February 2023 approval of FILSPARI (sparsentan). For the three and six months ended June 30, 2024, the Company capitalized $4.1 million and $7.0 million, respectively, to intangible assets for royalties owed on net sales of FILSPARI. The cost of the milestone payments and royalty payments are being amortized to selling, general and administration on a straight-line basis through April 30, 2033.

The following table sets forth amortizable intangible assets as of June 30, 2024 and December 31, 2023 (in thousands):


	June 30, 2024		December 31, 2023
Finite-lived intangible assets	$	203,017	$	183,037
Less: accumulated amortization	(98,596)		(79,347)
Net carrying value	$	104,421	$	103,690

As of June 30, 2024 and December 31, 2023, the Company had goodwill of $0.8 million.

The following table summarizes amortization expense for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Research and development	$	—	$	2,420	$	—	$	4,814
Selling, general and administrative	9,897		7,967		19,249		11,635
Total amortization expense	$	9,897	$	10,387	$	19,249	$	16,449

REVENUE RECOGNITION

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

Product Sales, Net

Product sales consist of FILSPARI and tiopronin products (Thiola and Thiola EC). The Company sells its products to specialty pharmacies and through direct-to-patient distributors worldwide, with the United States representing over 98% of net product sales.

The Company sells FILSPARI to three direct-to-patient specialty pharmacies. The Company sells its other products to patients and pharmacies, with distribution facilitated through a single direct-to-patient distributor. Revenues from product sales are recognized in satisfaction of a single performance obligation when the customer obtains control of the Company’s product. For FILSPARI, sales are recognized upon delivery of the product to the specialty pharmacies. The Company receives payments from its FILSPARI sales based on terms that are generally 30 days from shipment of the product to the specialty pharmacy. For the Company's other products, product sales are recognized upon delivery to the patient. The Company receives payments from sales of its other products, primarily through third party payers, based on terms that generally are within 30 days of delivery of product to the patient. Contracts do not contain significant financing components based on the typical period of time between performance of services and collection of consideration.

Deductions from Revenue

Revenues from product sales are recorded at the net sales price, which includes provisions resulting from discounts, rebates and co-pay assistance that are offered to customers, payers and other indirect customers relating to the Company’s sales of its products. These provisions are based on the estimates of the amounts earned or to be claimed on the related sales. These amounts are treated as variable consideration, estimated and recognized as a reduction of the transaction price at the time of the sale, using the most likely amount method, and are classified as a reduction of accounts receivable (if the amount is payable to a customer) or as a current liability (if the amount is payable to a party other than a customer). The Company includes these estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized for such transactions will not occur. Where appropriate, these reserves take into consideration the Company’s historical experience, current contractual and statutory requirements and specific known market events and trends. Overall, these reserves reflect the Company’s best estimates of the amount of consideration to which it is entitled based on the terms of the contract. If actual results in the future vary from the Company’s provisions, the Company will adjust the estimate, which would affect net product revenue and earnings in the period such variances become known. For the six months ended June 30, 2024 and 2023, adjustments to net product revenue related to performance obligations satisfied in previous periods were immaterial.

Government Rebates: The Company calculates the rebates that it will be obligated to provide to government programs and deducts these estimated amounts from its gross product sales at the time the revenues are recognized. Allowances for government rebates and discounts are established based on an estimated allocation of payers and the government-mandated discounts applicable to government-funded programs. Rebate discounts are included in accrued expenses in the accompanying Consolidated Balance Sheets.

Commercial Rebates: The Company calculates the rebates it incurs according to any contracts with certain commercial payers and deducts these amounts from its gross product sales at the time the revenues are recognized. Allowances for commercial rebates are established based on actual payer information, which is reasonably estimated at the time of delivery for applicable products. Rebate discounts are included in accrued expenses in the accompanying Consolidated Balance Sheets.

Prompt Pay Discounts: The Company offers discounts to certain customers for prompt payments. The Company accrues for the calculated prompt pay discount based on the gross amount of each invoice for those customers at the time of sale.

Product Returns: Consistent with industry practice, the Company offers its customers a limited right to return product purchased directly from the Company, which is principally based upon the product’s expiration date. Historically, returns have been immaterial.

Co-pay Assistance: The Company offers a co-pay assistance program, which is intended to provide financial assistance to qualified commercially insured patients with prescription drug co-payments required by payers. The calculation of the accrual for co-pay assistance is based on an estimate of claims and the estimated cost per claim associated with product that has been recognized as revenue.

The following table summarizes net product sales for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
FILSPARI	$	27,125	$	3,461	$	46,959	$	6,465
Tiopronin products	25,051		26,050		45,201		47,224
Total net product sales	$	52,176	$	29,511	$	92,160	$	53,689

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

ACCOUNTS RECEIVABLE	6 Months Ended
ACCOUNTS RECEIVABLE	Jun. 30, 2024
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE Accounts receivable, net of reserves for prompt pay discounts and expected credit losses, was $24.5 million and $21.2 million at June 30, 2024 and December 31, 2023, respectively. The total reserves for both periods were immaterial. The Company's evaluation and accounting for credit losses for the current period included an assessment of our aged trade receivables balances and their underlying credit risk characteristics. Our evaluation of past events, current conditions, and reasonable and supportable forecasts about the future resulted in an expectation of immaterial credit losses.

LEASES - Summary of Weighted-average Remaining Lease Term and Discount Rate (Details)	Jun. 30, 2024	Dec. 31, 2023
Leases [Abstract]
Weighted-average remaining lease term in years	4 years 2 months 12 days	4 years 8 months 12 days
Weighted-average discount rate	6.48%	6.48%

INVENTORY (Tables)

6 Months Ended

Jun. 30, 2024

Inventory Disclosure [Abstract]

Summary of Inventory

Inventory consisted of the following at June 30, 2024 and December 31, 2023 (in thousands):


	June 30, 2024		December 31, 2023
Raw materials	$	33,537	$	33,790
Work in process	5,529		4,727
Finished goods	3,914		2,387
Total inventory	$	42,980	$	40,904
Classified as:
Inventory	$	5,976	$	9,410
Long-term inventory	37,004		31,494
Total inventory	$	42,980	$	40,904

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Compensation related costs	$ 22,502	$ 29,908
Research and development	18,081	26,006
Sales discounts, rebates, and allowances	10,565	13,730
Accrued royalties	8,718	6,991
Selling, general and administrative	6,872	7,190
Accrued restructuring costs	1,054	11,421
Transition services accrual	346	12,282
Miscellaneous accrued expenses	11,503	11,463
Total accrued expenses	$ 79,641	$ 118,991

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Underwritten Equity Offering	Common Stock	Common Stock Underwritten Equity Offering	Additional Paid in Capital	Additional Paid in Capital Underwritten Equity Offering	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2022			64,290,570
Beginning balance at Dec. 31, 2022	$ 42,851		$ 6		$ 1,059,975		$ (2,907)	$ (1,014,223)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation	24,497				24,497
Issuance of common stock under the equity incentive plan and proceeds from exercise (in shares)			820,947
Issuance of common stock under the equity incentive plan and proceeds from exercise	3,089				3,089
Employee stock purchase program purchase and expense (in shares)			156,540
Employee stock purchase program purchase and expense	3,128				3,128
Issuance of common stock, net of issuance costs (in shares)				9,703,750
Issuance of common stock, net of issuance costs		$ 191,199		$ 1		$ 191,198
Issuance of pre-funded common stock warrants, net of issuance costs	24,630				24,630
Foreign currency translation adjustments	(736)						(736)
Unrealized loss on marketable debt securities	(212)						(212)
Net loss	(171,961)							(171,961)
Ending balance (in shares) at Jun. 30, 2023			74,971,807
Ending balance at Jun. 30, 2023	116,485		$ 7		1,306,517		(3,855)	(1,186,184)
Beginning balance (in shares) at Mar. 31, 2023			74,586,806
Beginning balance at Mar. 31, 2023	189,140		$ 7		1,291,863		(2,176)	(1,100,554)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation	11,172				11,172
Issuance of common stock under the equity incentive plan and proceeds from exercise (in shares)			228,461
Issuance of common stock under the equity incentive plan and proceeds from exercise	793				793
Employee stock purchase program purchase and expense (in shares)			156,540
Employee stock purchase program purchase and expense	2,689				2,689
Foreign currency translation adjustments	(170)						(170)
Unrealized loss on marketable debt securities	(1,509)						(1,509)
Net loss	(85,630)							(85,630)
Ending balance (in shares) at Jun. 30, 2023			74,971,807
Ending balance at Jun. 30, 2023	116,485		$ 7		1,306,517		(3,855)	(1,186,184)
Beginning balance (in shares) at Dec. 31, 2023			75,367,117
Beginning balance at Dec. 31, 2023	200,810		$ 7		1,327,881		(1,456)	(1,125,622)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation	19,035				19,035
Issuance of common stock under the equity incentive plan and proceeds from exercise (in shares)			849,945
Issuance of common stock under the equity incentive plan and proceeds from exercise	0		$ 1		(1)
Employee stock purchase program purchase and expense (in shares)			239,500
Employee stock purchase program purchase and expense	1,950				1,950
Foreign currency translation adjustments	1,033						1,033
Unrealized loss on marketable debt securities	(1,211)						(1,211)
Net loss	(206,470)							(206,470)
Ending balance (in shares) at Jun. 30, 2024			76,456,562
Ending balance at Jun. 30, 2024	15,147		$ 8		1,348,865		(1,634)	(1,332,092)
Beginning balance (in shares) at Mar. 31, 2024			76,108,829
Beginning balance at Mar. 31, 2024	74,071		$ 8		1,337,638		(1,892)	(1,261,683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation	9,615				9,615
Issuance of common stock under the equity incentive plan and proceeds from exercise (in shares)			108,233
Employee stock purchase program purchase and expense (in shares)			239,500
Employee stock purchase program purchase and expense	1,612				1,612
Foreign currency translation adjustments	404						404
Unrealized loss on marketable debt securities	(146)						(146)
Net loss	(70,409)							(70,409)
Ending balance (in shares) at Jun. 30, 2024			76,456,562
Ending balance at Jun. 30, 2024	$ 15,147		$ 8		$ 1,348,865		$ (1,634)	$ (1,332,092)

LEASES (Tables)

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Summary of Future Minimum Rental Commitments

The following is a schedule of the future minimum rental commitments for the Company's operating leases reconciled to the lease liability and ROU asset as of June 30, 2024 (in thousands):


	June 30, 2024
2024 (remaining six months)	$	3,261
2025	6,673
2026	6,889
2027	7,064
2028	4,781
Total undiscounted future minimum payments	28,668
Present value discount	(3,567)
Total lease liability	25,101
Unamortized lease incentives	(4,099)
Cash payments in excess of straight-line lease expense	(4,535)
Total ROU asset	$	16,467

Summary of Weighted-average Remaining Lease Term and Discount Rate

The weighted-average remaining lease term and weighted-average discount rate of the Company's operating leases are as follows:


	June 30, 2024		December 31, 2023
Weighted-average remaining lease term in years	4.2		4.7
Weighted-average discount rate	6.48	%	6.48	%

DIVESTITURES (Tables)

6 Months Ended

Jun. 30, 2024

Discontinued Operations and Disposal Groups [Abstract]

Summary Results, Assets and Liabilities of Discontinued Operations

Results of discontinued operations are as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Net product sales	$	(388)	$	27,501	$	(451)	$	53,606
Total revenue	(388)		27,501		(451)		53,606
Operating expenses:
Cost of goods sold	—		538		(10)		1,518
Research and development	203		2,919		234		4,670
Selling, general and administrative	166		5,834		185		12,129
Change in fair value of contingent consideration	—		1,840		—		8,596
Total operating expenses	369		11,131		409		26,913
Operating (loss) income	(757)		16,370		(860)		26,693
Other income (expenses), net:
Interest expense	—		(68)		—		(158)

Total other expense, net	—		(68)		—		(158)
Net (loss) income from discontinued operations	$	(757)	$	16,302	$	(860)	$	26,535

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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MARKETABLE DEBT SECURITIES - Summary of Marketable Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale marketable debt securities	$ 293,105	$ 508,675
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale marketable debt securities	0	34,458
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale marketable debt securities	228,320	368,323
Securities of government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Total available-for-sale marketable debt securities	$ 64,785	$ 105,894

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

INVENTORY (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Raw materials	$ 33,537	$ 33,790
Work in process	5,529	4,727
Finished goods	3,914	2,387
Total inventory	42,980	40,904
Inventory	5,976	9,410
Long-term inventory	$ 37,004	$ 31,494

DESCRIPTION OF BUSINESS	6 Months Ended
DESCRIPTION OF BUSINESS	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS	DESCRIPTION OF BUSINESS Organization and Description of Business Travere Therapeutics, Inc. (“we”, “our”, “us”, “Travere” and the “Company”) refers to Travere Therapeutics, Inc., a Delaware corporation, as well as its subsidiaries. Travere is a fully integrated biopharmaceutical company headquartered in San Diego, California focused on identifying, developing and delivering life-changing therapies to people living with rare kidney and metabolic diseases. The Company regularly evaluates and, where appropriate, acts on opportunities to expand its product pipeline through licenses and acquisitions of products in areas that will serve patients with serious unmet medical need and that the Company believes offer attractive growth characteristics. Discontinued Operations - Sale of Bile Acid Product Portfolio In July 2023, Travere entered into an Asset Purchase Agreement (the “Purchase Agreement”) with Mirum Pharmaceuticals, Inc. ("Mirum Pharmaceuticals" or “Mirum”), pursuant to which Mirum agreed to purchase from Travere substantially all of the assets primarily related to Travere’s business of development, manufacture (including synthesis, formulation, finishing or packaging) and commercialization of Chenodal and Cholbam (also known as Kolbam, and together with Chenodal, the “Products”), collectively, the "bile acid business". On August 31, 2023, the Company and Mirum consummated the transactions contemplated by the Purchase Agreement (the “Closing”). In connection with the Closing, Mirum paid Travere an upfront cash payment of $210.0 million. Pursuant to the Purchase Agreement, after the Closing, Travere is eligible to receive up to $235.0 million upon the achievement of certain milestones based on specified amounts of annual net sales (tiered from $125.0 million to $500.0 million) of the Products. The Company has reflected the bile acid business as a discontinued operation in the unaudited consolidated financial statements for all periods presented. See Note 18 for further discussion. Unless otherwise noted, amounts and disclosures throughout the Notes to the unaudited consolidated financial statements relate to the Company's continuing operations. Approved Products: FILSPARI® (sparsentan) On February 17, 2023, the U.S. Food and Drug Administration (the "FDA") granted accelerated approval of FILSPARI® (sparsentan) to reduce proteinuria in adults with primary IgAN at risk of rapid disease progression, generally a UPCR ≥1.5 gram/gram. FILSPARI, a once-daily, oral medication is designed to selectively target two critical pathways (endothelin 1 and angiotensin-II) in the disease progression of IgAN. This indication was granted under accelerated approval based on reduction in proteinuria. The continued approval of FILSPARI may be contingent upon confirmation of a clinical benefit in the Company's Phase 3 clinical trial of sparsentan for the treatment of IgAN (the "PROTECT Study"). In September 2023, the Company announced topline two-year confirmatory secondary endpoint results from the PROTECT Study and in December 2023, the Company announced the completion of a successful pre-NDA meeting with the FDA for FILSPARI in IgAN. In March 2024, the Company submitted a supplemental New Drug Application (sNDA) for conversion of the existing U.S. accelerated approval of FILSPARI to full approval. In May 2024, the Company announced that the FDA has accepted and granted Priority Review of its sNDA to convert FILSPARI from accelerated approval to full approval for the treatment of IgAN in the U.S. The FDA assigned a Prescription Drug User Fee Act (“PDUFA”) target action date of September 5, 2024. In September 2021, the Company entered into a license and collaboration agreement with Vifor (International) Ltd. ("CSL Vifor"). In April 2024, the Company and CSL Vifor announced that the European Commission has granted conditional marketing authorization (“CMA”) for FILSPARI (sparsentan) for the treatment of adults with primary IgAN with a urine protein excretion ≥1.0 g/day (or urine protein-to-creatinine ratio ≥0.75 g/g). The CMA is granted for all member states of the European Union, as well as in Iceland, Liechtenstein and Norway. The European Commission's decision follows the positive opinion from the Committee for Medicinal Products for Human Use (“CHMP”) in February 2024, based on results from the pivotal Phase 3 PROTECT Study of FILSPARI in IgAN. Under the terms of the License Agreement, the Company will be entitled to receive a regulatory milestone payment of $17.5 million upon receipt of full regulatory approval by the European Commission for IgAN, and an additional milestone payment upon achievement of market access initiatives in certain countries. Thiola® and Thiola EC® (tiopronin tablets) Thiola® and Thiola EC® (tiopronin tablets) are approved in the United States for the prevention of cystine (kidney) stone formation in patients with severe homozygous cystinuria. Clinical-Stage Programs: Sparsentan for the treatment of FSGS Sparsentan remains a novel investigational product candidate which has been granted Orphan Drug Designation for the treatment of focal segmental glomerulosclerosis (FSGS) in the U.S. and the European Economic Area countries (the “EEA”). In December 2023, the Company announced that it had completed its planned Type C meeting with the FDA to discuss previously reported results from the Phase 3 DUPLEX Study of sparsentan in FSGS. The FDA acknowledged the high unmet need for approved therapies as well as the challenges in studying FSGS but indicated that the two-year results from the Phase 3 DUPLEX Study alone were not sufficient to support an sNDA submission. Together with CSL Vifor, the Company also plans to engage with the EMA to determine the potential for a subsequent variation to the CMA of sparsentan for the treatment of FSGS, subject to a review decision on the pending application for CMA of sparsentan in IgAN. The Company is conducting additional analyses of FSGS data and plans to engage with regulators to evaluate potential regulatory pathways for a sparsentan FSGS indication. Pegtibatinase Pegtibatinase is a novel investigational human enzyme replacement candidate being evaluated for the treatment of classical homocystinuria (HCU). Pegtibatinase has been granted Rare Pediatric Disease, Fast Track and Breakthrough Therapy designations by the FDA, as well as orphan drug designation in the United States and European Union. In May 2023, the Company announced positive topline results from cohort 6 in the Phase 1/2 COMPOSE Study. In December 2023, the Company initiated the pivotal Phase 3 HARMONY Study to support the potential approval of pegtibatinase for the treatment of classical HCU. The HARMONY Study is a global, randomized, multi-center, double-blind, placebo-controlled Phase 3 clinical trial designed to evaluate the efficacy and safety of pegtibatinase as a novel treatment to reduce total homocysteine (tHcy) levels. In the beginning of 2024, the first patients were dosed in the HARMONY Study. Topline results from the HARMONY Study are expected in 2026. The Company acquired pegtibatinase as part of the November 2020 acquisition of Orphan Technologies Limited. Preclinical Programs: The Company is party to a collaboration agreement with PharmaKrysto Limited and their early-stage cystinuria discovery program, whereby the Company is responsible for funding all research and development expenses for the pre-clinical activities associated with the cystinuria program.

LEASES - Summary of Future Minimum Rental Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Leases [Abstract]
2024 (remaining six months)	$ 3,261
2025	6,673
2026	6,889
2027	7,064
2028	4,781
Total undiscounted future minimum payments	28,668
Present value discount	(3,567)
Total lease liability	25,101
Unamortized lease incentives	(4,099)
Cash payments in excess of straight-line lease expense	(4,535)
Total ROU asset	$ 16,467	$ 18,061

ACCRUED EXPENSES

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

ACCRUED EXPENSES

Accrued expenses at June 30, 2024 and December 31, 2023 consisted of the following (in thousands):


	June 30, 2024		December 31, 2023

Compensation related costs	$	22,502	$	29,908
Research and development	18,081		26,006
Sales discounts, rebates, and allowances	10,565		13,730
Accrued royalties	8,718		6,991
Selling, general and administrative	6,872		7,190
Accrued restructuring costs	1,054		11,421
Transition services accrual	346		12,282
Miscellaneous accrued expenses	11,503		11,463
Total accrued expenses	$	79,641	$	118,991

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Total revenue	$ 54,116	$ 32,196	$ 95,490	$ 63,084
Operating expenses:
Cost of goods sold	2,061	1,452	3,565	5,597
Research and development	54,330	66,492	103,750	124,654
Selling, general and administrative	64,776	68,203	128,999	134,153
In-process research and development	0	0	65,205	0
Restructuring	653	0	912	0
Total operating expenses	121,820	136,147	302,431	264,404
Operating loss	(67,704)	(103,951)	(206,941)	(201,320)
Other (expense) income, net:
Interest income	4,420	5,128	10,452	8,774
Interest expense	(2,788)	(2,843)	(5,588)	(5,693)
Other (expense) income, net	(3,495)	(201)	(3,257)	(114)
Total other (expense) income, net	(1,863)	2,084	1,607	2,967
Loss from continuing operations before income tax provision	(69,567)	(101,867)	(205,334)	(198,353)
Income tax provision on continuing operations	(85)	(65)	(276)	(143)
Loss from continuing operations, net of tax	(69,652)	(101,932)	(205,610)	(198,496)
(Loss) income from discontinued operations, net of tax	(757)	16,302	(860)	26,535
Net loss	$ (70,409)	$ (85,630)	$ (206,470)	$ (171,961)
Basic and diluted:
Net loss from continuing operations, basic (in dollars per share)	$ (0.90)	$ (1.34)	$ (2.66)	$ (2.75)
Net loss from continuing operations, diluted (in dollars per share)	(0.90)	(1.34)	(2.66)	(2.75)
Net (loss) income from discontinued operations, basic (in dollars per share)	(0.01)	0.21	(0.01)	0.37
Net (loss) income from discontinued operations, diluted (in dollars per share)	(0.01)	0.21	(0.01)	0.37
Net loss per common share, basic (in dollars per share)	(0.91)	(1.13)	(2.67)	(2.38)
Net loss per common share, diluted (in dollars per share)	$ (0.91)	$ (1.13)	$ (2.67)	$ (2.38)
Weighted average common shares outstanding, basic (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Weighted average common shares outstanding, diluted (in shares)	77,500,245	76,001,801	77,318,369	72,109,573
Comprehensive loss:
Net loss	$ (70,409)	$ (85,630)	$ (206,470)	$ (171,961)
Foreign currency translation gain (loss)	404	(170)	1,033	(736)
Unrealized loss on marketable debt securities	(146)	(1,509)	(1,211)	(212)
Comprehensive loss	(70,151)	(87,309)	(206,648)	(172,909)
Net product sales
Total revenue	52,176	29,511	92,160	53,689
Operating expenses:
Cost of goods sold	1,929	1,445	3,433	2,553
License and collaboration revenue
Total revenue	1,940	2,685	3,330	9,395
Operating expenses:
Cost of goods sold	$ 132	$ 7	$ 132	$ 3,044

CONVERTIBLE NOTES PAYABLE (Tables)

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Summary of Long-term Debt Instruments

The composition of the Company’s convertible senior notes are as follows (in thousands):


	June 30, 2024		December 31, 2023
2.25% convertible senior notes due 2029	$	316,250	$	316,250
2.50% convertible senior notes due 2025	68,904		68,904
Unamortized debt issuance costs - 2.25% convertible senior notes due 2029	(6,645)		(7,348)
Unamortized debt issuance costs - 2.50% convertible senior notes due 2025	(384)		(543)
Total convertible senior notes, net of unamortized debt discount and debt issuance costs	$	378,125	$	377,263

The following table sets forth total interest expense recognized related to the 2025 and 2029 Notes (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Contractual interest expense	$	2,210	$	2,210	$	4,419	$	4,419
Amortization of debt issuance costs	431		429		862		858
Total interest expense for the 2025 and 2029 Notes	$	2,641	$	2,639	$	5,281	$	5,277

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

+ Details

LEASES

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

LEASES

As of June 30, 2024, the Company had two operating leases, including one operating lease with Kilroy Realty, L.P. (the "Landlord") for office space located in San Diego, California, which was entered into in April 2019 and subsequently amended in May 2020. Coinciding with the Company's ability to direct the use of the office space, which occurred in phases over 2020, and utilizing a discount rate equal to the Company's estimated incremental borrowing rate, the Company established ROU assets totaling $34.6 million and lease liabilities totaling $34.5 million. The total ROU asset and lease liability at measurement were each offset by lease incentives associated with tenant improvement allowances totaling $7.9 million.

The initial term of the office lease ends in August 2028, and the Landlord has granted the Company an option to extend the term of the lease by a period of 5 years. At lease inception, it was not reasonably certain that the Company will extend the term of the lease and therefore the renewal period has been excluded from the aforementioned ROU asset and lease liability measurements. The measurement of the lease term occurs from the February 2021 occupancy date of the office space.

The Company has one operating lease with Esprit Investments Limited for office space located in Dublin, Ireland, which was entered into in October 2022. The initial term of the office lease ends in September 2027. The lease provides the option to extend the term of the lease by a period of 5 years, although at lease inception, it was not reasonably certain that the Company would elect this option and therefore the renewal period was excluded from the initial lease measurement. Utilizing a discount rate equal to the Company's estimated incremental borrowing rate, the Company established an ROU asset and corresponding lease liability of $0.4 million.

The following is a schedule of the future minimum rental commitments for the Company's operating leases reconciled to the lease liability and ROU asset as of June 30, 2024 (in thousands):


	June 30, 2024
2024 (remaining six months)	$	3,261
2025	6,673
2026	6,889
2027	7,064
2028	4,781
Total undiscounted future minimum payments	28,668
Present value discount	(3,567)
Total lease liability	25,101
Unamortized lease incentives	(4,099)
Cash payments in excess of straight-line lease expense	(4,535)
Total ROU asset	$	16,467

The weighted-average remaining lease term and weighted-average discount rate of the Company's operating leases are as follows:


	June 30, 2024		December 31, 2023
Weighted-average remaining lease term in years	4.2		4.7
Weighted-average discount rate	6.48	%	6.48	%

For the three and six months ended June 30, 2024, the Company recorded $1.2 million and $2.4 million, respectively, in expense related to operating leases, including amortized tenant improvement allowances. For the three and six months ended June 30, 2023, the Company recorded $1.2 million and $2.5 million, respectively, in expense related to operating leases, including amortized tenant improvement allowances.

CONVERTIBLE NOTES PAYABLE

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

CONVERTIBLE NOTES PAYABLE

The composition of the Company’s convertible senior notes are as follows (in thousands):


	June 30, 2024		December 31, 2023
2.25% convertible senior notes due 2029	$	316,250	$	316,250
2.50% convertible senior notes due 2025	68,904		68,904
Unamortized debt issuance costs - 2.25% convertible senior notes due 2029	(6,645)		(7,348)
Unamortized debt issuance costs - 2.50% convertible senior notes due 2025	(384)		(543)
Total convertible senior notes, net of unamortized debt discount and debt issuance costs	$	378,125	$	377,263

Convertible Senior Notes Due 2029

On March 11, 2022, the Company completed a registered underwritten public offering of $316.3 million aggregate principal amount of 2.25% Convertible Senior Notes due 2029 (“2029 Notes”), which includes $41.3 million aggregate principal amount of 2029 Notes sold pursuant to the full exercise of the underwriters’ option to purchase additional 2029 Notes. The Company issued the 2029 Notes under an indenture, dated as of September 10, 2018, as supplemented by the second supplemental indenture, dated as of March 11, 2022 (collectively, the “2029 Indenture”). The 2029 Notes will mature on March 1, 2029, unless earlier repurchased, redeemed, or converted. The 2029 Notes are senior unsecured obligations of the Company and bear interest at an annual rate of 2.25%, payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2022.

The Company received net proceeds from the issuance of the 2029 Notes of $306.4 million, after deducting commissions and offering expenses of $9.9 million. At June 30, 2024, accrued interest on the 2029 Notes of $2.4 million is included in accrued expenses in the accompanying Consolidated Balance Sheets. The 2029 Notes comprise the Company’s senior, unsecured obligations and are (i) equal in right of payment with the Company’s existing and future senior, unsecured indebtedness; (ii) senior in right of payment to the Company’s existing and future indebtedness that is expressly subordinated to the 2029 Notes; (iii) effectively subordinated to the Company’s existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness; and (iv) structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables.

Holders may convert their 2029 Notes at their option only in the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2022 (and only during such calendar quarter), if the last reported sale price per share of the Company’s common stock for each of at least 20 trading days, whether or not consecutive, during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price on the applicable trading day; (2) during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) if the trading price per $1,000 principal amount of 2029 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company’s common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions of the Company’s common stock; (4) if the Company calls the 2029 Notes for redemption; and (5) at any time from, and including, December 1, 2028 until the close of business on the scheduled trading day immediately before the maturity date. The Company will settle conversions by paying or delivering, as applicable, cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s election, based on the applicable conversion rate. The initial conversion rate for the 2029 Notes is 31.3740 shares of the Company’s common stock per $1,000 principal amount of 2029 Notes, which represents an initial conversion price of approximately $31.87 per share. If a “make-whole fundamental change” (as defined in the 2029 Indenture) occurs, then the Company will, in certain circumstances, increase the conversion rate for a specified period of time.

The 2029 Notes will be redeemable, in whole or in part at the Company’s option at any time, and from time to time, on or after March 2, 2026 and, in the case of any partial redemption, on or before the 40th scheduled trading day before the maturity date, at a cash redemption price equal to the principal amount of the 2029 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date but only if the last reported sale price per

share of the Company’s common stock exceeds 130% of the conversion price on (1) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date the Company sends the related redemption notice; and (2) the trading day immediately before the date the Company sends such notice. However, the Company may not redeem less than all of the outstanding 2029 Notes unless at least $100.0 million aggregate principal amount of 2029 Notes are outstanding and not called for redemption as of the time the Company sends the related redemption notice. In addition, calling any 2029 Note for redemption will constitute a make-whole fundamental change with respect to that 2029 Note, in which case the conversion rate applicable to the conversion of that 2029 Note will be increased in certain circumstances if it is converted after it is called for redemption. If a fundamental change (as defined in the 2029 Indenture) occurs, then, except as described in the 2029 Indentures, holders may require the Company to repurchase their 2029 Notes at a cash repurchase price equal to the principal amount of the 2029 Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. In the event of conversion, holders would forgo all future interest payments, any unpaid accrued interest and the possibility of further stock price appreciation. Upon the receipt of conversion requests, the settlement of the 2029 Notes will be paid pursuant to the terms of the 2029 Indenture. In the event that all of the 2029 Notes are converted, the Company would be required to repay the principal amount and any conversion premium in any combination of cash and shares of its common stock at the Company’s option. In addition, calling the 2029 Notes for redemption will constitute a “make-whole fundamental change."

The Company incurred approximately $9.9 million of debt issuance costs relating to the issuance of the 2029 Notes, which were recorded as a reduction to the 2029 Notes on the Consolidated Balance Sheets. The debt issuance costs are being amortized and recognized as additional interest expense over the expected life of the 2029 Notes using the effective interest method. We determined the expected life of the debt is equal to the seven-year term of the 2029 Notes. The effective interest rate on the 2029 Notes is 2.74%.

Convertible Senior Notes Due 2025

On September 10, 2018, the Company completed a registered underwritten public offering of $276.0 million aggregate principal amount of 2.50% Convertible Senior Notes due 2025 ("2025 Notes"), and entered into a base indenture and supplemental indenture agreement (collectively, the "2025 Indenture") with respect to the 2025 Notes. The 2025 Notes will mature on September 15, 2025, unless earlier repurchased, redeemed, or converted. The 2025 Notes are senior unsecured obligations of the Company and bear interest at an annual rate of 2.50%, payable semi-annually in arrears on March 15 and September 15 of each year, beginning on March 15, 2019.

The net proceeds from the issuance of the 2025 Notes were approximately $267.2 million, after deducting commissions and the offering expenses of $8.8 million payable by the Company. At June 30, 2024, accrued interest of $0.5 million is included in accrued expenses in the accompanying Consolidated Balance Sheets. The 2025 Notes comprise the Company’s senior, unsecured obligations and are (i) equal in right of payment with the Company’s existing and future senior, unsecured indebtedness; (ii) senior in right of payment to the Company’s existing and future indebtedness that is expressly subordinated to the 2025 Notes; (iii) effectively subordinated to the Company’s existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness; and (iv) structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables.

Holders may convert their 2025 Notes at their option only in the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on December 31, 2018 (and only during such calendar quarter), if the last reported sale price per share of the Company’s common stock for each of at least 20 trading days, whether or not consecutive, during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price on the applicable trading day; (2) during the five consecutive business days immediately after any 10 consecutive trading day period (“measurement period”) if the trading price per $1,000 principal amount of 2025 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company’s common stock on such trading day and the conversion rate on such trading day; (3) upon the occurrence of certain corporate events or distributions on the Company’s common stock; (4) if the Company calls the 2025 Notes for redemption; and (5) at any time from, and including, May 15, 2025 until the close of business on the scheduled trading day immediately before the maturity date. The Company will settle conversions by paying or delivering, as applicable, cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s election, based on the applicable conversion rate.

The initial conversion rate for the 2025 Notes is 25.7739 shares of the Company’s common stock per $1,000 principal amount of 2025 Notes, which represents an initial conversion price of approximately $38.80 per share. If a “make-whole fundamental change” (as defined in the 2025 Indenture) occurs, then the Company will, in certain circumstances, increase the conversion rate for a specified period of time.

The 2025 Notes will be redeemable, in whole or in part, at the Company’s option at any time, and from time to time, on or after September 15, 2022 and, in the case of any partial redemption, on or before the 40th scheduled trading day before the maturity date, at a cash redemption price equal to the principal amount of the 2025 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of the Company’s common stock exceeds 130% of the conversion price on each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the trading day immediately before the date the Company sends the related redemption notice. If a fundamental change (as defined in the 2025 Indenture) occurs, then, subject to certain exceptions, holders may require the Company to repurchase their 2025 Notes at a cash repurchase price equal to the principal amount of the 2025 Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. In the event of conversion, holders would forgo all future interest payments, any unpaid accrued interest and the possibility of further stock price appreciation. Upon the receipt of conversion requests, the settlement of the 2025 Notes will be paid pursuant to the terms of the 2025 Indenture. In the event that all of the 2025 Notes are converted, the Company would be required to repay the principal amount and any conversion premium in any combination of cash and shares of its common stock at the Company’s option. In addition, calling the 2025 Notes for redemption will constitute a “make-whole fundamental change."

The Company incurred approximately $8.8 million of debt issuance costs relating to the issuance of the 2025 Notes, which were recorded as a reduction to the 2025 Notes on the Consolidated Balance Sheets. The debt issuance costs are being amortized and recognized as additional interest expense over the expected life of the 2025 Notes using the effective interest method. The Company determined the expected life of the debt is equal to the seven-year term of the 2025 Notes. The effective interest rate on the 2025 Notes is 2.98%.

On March 11, 2022, the Company completed its repurchase of $207.1 million aggregate principal amount of 2025 Notes for cash, including accrued and unpaid interest, for a total of $213.8 million. This transaction involved a contemporaneous exchange of cash between the Company and holders of the 2025 Notes participating in the issuance of the 2029 Notes. Accordingly, we evaluated the transaction for modification or extinguishment accounting in accordance with ASC 470-50, Debt – Modifications and Extinguishments on a creditor-by creditor basis depending on whether the exchange was determined to have substantially different terms. The repurchase of the 2025 Notes and issuance of the 2029 Notes were deemed to have substantially different terms based on the present value of the cash flows or significant difference between the value of the conversion option immediately prior to and after the exchange. Therefore, the repurchase of the 2025 Notes was accounted for as a debt extinguishment. The Company recorded a $7.6 million loss on extinguishment of debt on its Consolidated Statements of Operations for the six months ended June 30, 2023, which includes the write-off of related deferred financing costs of $3.4 million. After giving effect to the repurchase, the total remaining principal amount outstanding under the 2025 Notes as of June 30, 2024 was $68.9 million.

The 2025 and 2029 Notes are accounted for in accordance with ASC 470-20, Debt with conversion and Other Options (“ASC 470-20”) and ASC 815-40, Contracts in Entity’s Own Equity (“ASC 815-40”). Under ASC 815-40, to qualify for equity classification (or nonbifurcation, if embedded) the instrument (or embedded feature) must be both (1) indexed to the issuer’s stock and (2) meet the requirements of equity classification guidance. Based upon the Company’s analysis, it was determined that the 2025 Notes and the 2029 Notes do not contain embedded features requiring recognition as derivatives and bifurcation, and therefore are measured at amortized cost and recorded as liabilities on the Consolidated Balance Sheets.

The 2025 and 2029 Notes do not contain any financial or operating covenants or any restrictions on the payment of dividends, the issuance of other indebtedness or the issuance or repurchase of securities by the Company. There were no events of default for the 2025 Notes or 2029 Notes at June 30, 2024.

The 2025 and 2029 Notes are classified on the Company's Consolidated Balance Sheets at June 30, 2024 as long-tern convertible debt.

The following table sets forth total interest expense recognized related to the 2025 and 2029 Notes (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Contractual interest expense	$	2,210	$	2,210	$	4,419	$	4,419
Amortization of debt issuance costs	431		429		862		858
Total interest expense for the 2025 and 2029 Notes	$	2,641	$	2,639	$	5,281	$	5,277

Total interest expense recognized for the three and six months ended June 30, 2024 was $2.8 million and $5.6 million, respectively. Total interest expense recognized for the three and six months ended June 30, 2023 was $2.8 million and $5.7 million, respectively.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

+ Details

REVENUE RECOGNITION (Tables)

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Summary of Net Product Revenue

The following table summarizes net product sales for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
FILSPARI	$	27,125	$	3,461	$	46,959	$	6,465
Tiopronin products	25,051		26,050		45,201		47,224
Total net product sales	$	52,176	$	29,511	$	92,160	$	53,689

DIVESTITURES

6 Months Ended

Jun. 30, 2024

Discontinued Operations and Disposal Groups [Abstract]

DIVESTITURES

Discontinued Operations

Sale of Bile Acid Product Portfolio

On August 31, 2023, the Company closed the sale of its bile acid business to Mirum Pharmaceuticals pursuant to the terms of the Purchase Agreement dated July 16, 2023 between the Company and Mirum. The assets sold consisted of substantially all of the assets primarily related to the Company’s business of development, manufacture (including synthesis, formulation, finishing or packaging) and commercialization of the products, Chenodal and Cholbam (also known as Kolbam). In connection with the Closing, the Company received an upfront cash payment of $210.0 million.

Pursuant to the Purchase Agreement, after the Closing, the Company is eligible to receive up to $235.0 million upon the achievement of certain milestones based on specified amounts of annual net sales (tiered from $125.0 million to $500.0 million) of the Products. The Company will recognize the contingent consideration receivable in earnings when the target annual sales for the milestones are met and the contingency is resolved.

The Company's sale of the bile acid business resulted in a gain, net of tax, of $226.0 million, which was recognized in 2023. The net gain consists of net consideration, including the upfront payment and the deduction of investment banker fees owed upon Closing, plus the derecognition of the carrying value of the net liabilities included in the transaction and the immaterial tax due on the sale.

The Company and Mirum have also entered into a transition services agreement ("TSA") pursuant to which the Company has agreed to perform certain services for a period of time following the Closing, with respect to Mirum’s use and operation of the assets purchased in the Purchase Agreement. The TSA is designed to ensure and facilitate an orderly transfer of business operations, and the consideration to be received by the Company primarily consists of cost reimbursement. For the three and six months ended June 30, 2024, the Company recognized $0.1 million and $0.5 million, respectively, under the TSA, included in continuing operations within other income (expense), net. The uncollected balance is included in accounts receivable of the Consolidated Balance Sheets. As part of the TSA, the Company is collecting certain receivables related to purchased assets for a period of time and remitting them to Mirum. The transition services accrual as of June 30, 2024 was $0.3 million, and is included in accrued expenses in the accompanying Consolidated Balance Sheets. TSA services provided by the Company are anticipated to be substantially complete 12 months post-close.

The Company determined that the divestiture represents a strategic shift that will have a major effect on the Company's operations and financial results, and has therefore reflected the bile acid business as a discontinued operation for all periods presented.

Results of discontinued operations are as follows (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Net product sales	$	(388)	$	27,501	$	(451)	$	53,606
Total revenue	(388)		27,501		(451)		53,606
Operating expenses:
Cost of goods sold	—		538		(10)		1,518
Research and development	203		2,919		234		4,670
Selling, general and administrative	166		5,834		185		12,129
Change in fair value of contingent consideration	—		1,840		—		8,596
Total operating expenses	369		11,131		409		26,913
Operating (loss) income	(757)		16,370		(860)		26,693
Other income (expenses), net:
Interest expense	—		(68)		—		(158)

Total other expense, net	—		(68)		—		(158)
Net (loss) income from discontinued operations	$	(757)	$	16,302	$	(860)	$	26,535

The Company held no assets or liabilities of discontinued operations as of June 30, 2024 and December 31, 2023.

VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Thousands	1 Months Ended
	Mar. 31, 2022	Jun. 30, 2024	Dec. 31, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Other non-current liabilities		$ 16,643	$ 8,485
Other assets		16,919	$ 10,661
Variable Interest Entity, Not Primary Beneficiary
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Other non-current liabilities		8,300
Other assets		$ 0
Collaborative Arrangement \| PharmaKrysto, LTD
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration agreement payment	$ 400
Research and development expenses, estimated	5,000
Collaborative arrangement, option to purchase additional shares of VIE, amount	1,000
Collaborative arrangement, option to purchase remaining shares of VIE, amount	5,000
Milestone payments contingently due	$ 16,000
Royalty payments, percentage (less than)	4.00%
Agreement termination notice period	60 days
Percentage of research and development to be funded by the company	100.00%
PharmaKrysto, LTD
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payment to purchase interest in VIE	$ 600
Percentage ownership purchased	5.00%
PharmaKrysto, LTD \| Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Additional ownership interest to be purchased upon achievement of certain milestones	5.00%

BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES - Additional Information (Details)	1 Months Ended	3 Months Ended		6 Months Ended		7 Months Ended
	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) clinicalTrial	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of phase one-half clinical trials in process \| clinicalTrial				1
Number of phase 2 clinical trials in process \| clinicalTrial				2
Number of phase 3 clinical trials in process \| clinicalTrial				3
In-process research and development	$ 65,200,000	$ 0	$ 0	$ 65,205,000	$ 0
Equity method investments		0		0		$ 0
Restructuring costs		700,000		900,000		12,300,000
Accrued restructuring costs		1,054,000		1,054,000		1,054,000	$ 11,421,000
Payments				11,313,000	$ 0
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring and related cost, expected cost							12,000,000
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring and related cost, expected cost							$ 14,000,000
Equity Method Investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
In-process research and development		3,400,000		3,400,000
FILSPARI
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Zero cost inventory		$ 3,500,000		$ 3,500,000		$ 3,500,000

NET LOSS PER COMMON SHARE (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Summary of Basic and Diluted Net Income (Loss) Per Share

Basic and diluted net income (loss) per share is calculated as follows (net loss amounts are stated in thousands):
























	Three Months Ended June 30,
	2024					2023
	Shares	Net Income (loss)		EPS		Shares	Net Income (loss)		EPS
Continuing operations	77,500,245	$	(69,652)	$	(0.90)	76,001,801	$	(101,932)	$	(1.34)
Discontinued operations	77,500,245	$	(757)	$	(0.01)	76,001,801	$	16,302	$	0.21
Basic and diluted loss per share	77,500,245	$	(70,409)	$	(0.91)	76,001,801	$	(85,630)	$	(1.13)


	Six Months Ended June 30,
	2024					2023
	Shares	Net Income (loss)		EPS		Shares	Net Income (loss)		EPS
Continuing operations	77,318,369	$	(205,610)	$	(2.66)	72,109,573	$	(198,496)	$	(2.75)
Discontinued operations	77,318,369	$	(860)	$	(0.01)	72,109,573	$	26,535	$	0.37
Basic and diluted loss per share	77,318,369	$	(206,470)	$	(2.67)	72,109,573	$	(171,961)	$	(2.38)

Summary of Common Stock Options, Convertible Debt and Restricted Stock Units Anti-dilutive

The following common stock equivalents have been excluded because they were anti-dilutive:


	Three Months Ended June 30,		Six Months Ended June 30,
	2024	2023	2024	2023
Convertible debt	11,697,952	11,697,952	11,697,952	11,697,952
Options	11,121,357	10,719,869	11,024,633	10,633,802
Restricted stock	4,073,280	3,626,814	3,921,208	3,453,767

Total anti-dilutive shares	26,892,589	26,044,635	26,643,793	25,785,521

MARKETABLE DEBT SECURITIES - Summary of Marketable Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 123,873	$ 227,533
Less than 12 months, unrealized losses	129	639
12 months or greater, fair value	127,658	41,315
12 months or greater, unrealized losses	413	260
Total, fair value	251,531	268,848
Total, unrealized losses	542	899
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	108,950	140,802
Less than 12 months, unrealized losses	128	405
12 months or greater, fair value	82,756	28,775
12 months or greater, unrealized losses	266	177
Total, fair value	191,706	169,577
Total, unrealized losses	394	582
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value		24,798
Less than 12 months, unrealized losses		17
12 months or greater, fair value		0
12 months or greater, unrealized losses		0
Total, fair value		24,798
Total, unrealized losses		17
Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	14,923	61,933
Less than 12 months, unrealized losses	1	217
12 months or greater, fair value	44,902	12,540
12 months or greater, unrealized losses	147	83
Total, fair value	59,825	74,473
Total, unrealized losses	$ 148	$ 300

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net loss	$ (70,409)	$ (85,630)	$ (206,470)	$ (171,961)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147483443/250-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Subparagraph (SX 210.5-03(20))
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/exampleRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 35: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

MARKETABLE DEBT SECURITIES - Summary of Short-term Marketable Debt Securities Classified as Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Marketable debt securities, available-for-sale, amortized cost basis, current	$ 222,153	$ 249,247
Marketable debt securities, available for sale, unrealized gain, current	16	90
Marketable debt securities, available for sale, unrealized loss, current	(517)	(699)
Marketable debt securities, available-for-sale, current	221,652	248,638
Marketable debt securities, available-for-sale, amortized cost basis, noncurrent	71,421	258,687
Marketable debt securities, available for sale, unrealized gain, noncurrent	57	1,550
Marketable debt securities, available for sale, unrealized loss, noncurrent	(25)	(200)
Marketable debt securities, available-for-sale, noncurrent	71,453	260,037
Marketable debt securities, available-for-sale, amortized cost	293,574	507,934
Marketable debt securities, available for sale, unrealized gains	73	1,640
Marketable debt securities, available-for-sale, unrealized loss	(542)	(899)
Total available-for-sale marketable debt securities	293,105	508,675
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Marketable debt securities, available-for-sale, amortized cost basis, current	157,222	133,463
Marketable debt securities, available for sale, unrealized gain, current	14	29
Marketable debt securities, available for sale, unrealized loss, current	(369)	(408)
Marketable debt securities, available-for-sale, current	156,867	133,084
Marketable debt securities, available-for-sale, amortized cost basis, noncurrent	71,421	233,969
Marketable debt securities, available for sale, unrealized gain, noncurrent	57	1,444
Marketable debt securities, available for sale, unrealized loss, noncurrent	(25)	(174)
Marketable debt securities, available-for-sale, noncurrent	71,453	235,239
Total available-for-sale marketable debt securities	228,320	368,323
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Marketable debt securities, available-for-sale, amortized cost basis, current		34,450
Marketable debt securities, available for sale, unrealized gain, current		25
Marketable debt securities, available for sale, unrealized loss, current		(17)
Marketable debt securities, available-for-sale, current		34,458
Total available-for-sale marketable debt securities	0	34,458
Securities of government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Marketable debt securities, available-for-sale, amortized cost basis, current	64,931	81,334
Marketable debt securities, available for sale, unrealized gain, current	2	36
Marketable debt securities, available for sale, unrealized loss, current	(148)	(274)
Marketable debt securities, available-for-sale, current	64,785	81,096
Marketable debt securities, available-for-sale, amortized cost basis, noncurrent		24,718
Marketable debt securities, available for sale, unrealized gain, noncurrent		106
Marketable debt securities, available for sale, unrealized loss, noncurrent		(26)
Marketable debt securities, available-for-sale, noncurrent		24,798
Total available-for-sale marketable debt securities	$ 64,785	$ 105,894

BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2024

Accounting Policies [Abstract]

Summary of Cost and Goods Sold

The following table summarizes cost of goods sold for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Cost of goods sold - product sales	$	1,929	$	1,445	$	3,433	$	2,553
Cost of goods sold - license and collaboration	132		7		132		3,044
Total cost of goods sold	$	2,061	$	1,452	$	3,565	$	5,597

Summary of Restructuring and Related Costs

The following table sets forth a summary of changes in accrued restructuring costs for the six months ended June 30, 2024 and 2023 (in thousands):


	Restructuring
	2024		2023
Liability balance at January 1,	$	11,421	$	—
Restructuring expenses	912		—
Payments	(11,313)		—
Foreign currency impact	34		—
Liability balance at June 30,	$	1,054	$	—

CONVERTIBLE NOTES PAYABLE - Summary of Interest Expense (Details) - Senior Notes Due 2025 and Senior Notes Due 2029 - Senior Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Instrument [Line Items]
Contractual interest expense	$ 2,210	$ 2,210	$ 4,419	$ 4,419
Amortization of debt issuance costs	431	429	862	858
Total interest expense for the 2025 and 2029 Notes	$ 2,641	$ 2,639	$ 5,281	$ 5,277

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Summary of Fair Value on a Recurring Basis

The following table presents the Company’s assets, measured and recognized at fair value on a recurring basis, classified under the appropriate level of the fair value hierarchy as of June 30, 2024 (in thousands):


	As of June 30, 2024
	Total carrying and estimated fair value		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	$	32,291	$	32,291	$	—	$	—
Marketable debt securities, available-for-sale	293,105		—		293,105		—
Total	$	325,396	$	32,291	$	293,105	$	—


	As of December 31, 2023
	Total carrying and estimated fair value		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	$	58,176	$	58,176	$	—	$	—
Marketable debt securities, available-for-sale	508,675		—		508,675		—
Total	$	566,851	$	58,176	$	508,675	$	—

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Jun. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

INVENTORY

6 Months Ended

Jun. 30, 2024

Inventory Disclosure [Abstract]

INVENTORY

Inventory consisted of the following at June 30, 2024 and December 31, 2023 (in thousands):


	June 30, 2024		December 31, 2023
Raw materials	$	33,537	$	33,790
Work in process	5,529		4,727
Finished goods	3,914		2,387
Total inventory	$	42,980	$	40,904
Classified as:
Inventory	$	5,976	$	9,410
Long-term inventory	37,004		31,494
Total inventory	$	42,980	$	40,904

The balance classified as long-term inventory consists of raw materials and work in process for FILSPARI as of June 30, 2024 and December 31, 2023. The Company maintains levels of these inventories beyond a one-year production plan to limit exposure to potential supply disruption. Such inventories are classified as long-term.

EQUITY OFFERINGS	6 Months Ended
EQUITY OFFERINGS	Jun. 30, 2024
Equity [Abstract]
EQUITY OFFERINGS	EQUITY OFFERINGS Underwritten Public Offering of Common Stock In February 2023, the Company sold an aggregate of approximately 9.7 million shares of its common stock and pre-funded warrants to purchase 1.25 million shares of its common stock in an underwritten public offering, at a price to the public of $21.00 per share of common stock and $20.9999 per pre-funded warrant. The pre-funded warrants are exercisable immediately, subject to certain beneficial ownership limitations which can be modified by the respective holders with at least 61 days' notice, and are exercisable for one share of the Company's common stock. The exercise price of each pre-funded warrant is $0.0001 per share of common stock. The net proceeds to the Company from the offering, after deducting the underwriting discounts and offering expenses, were approximately $215.8 million. The pre-funded warrants were classified as a component of permanent stockholders' equity within additional paid-in capital and were recorded at the issuance date using a relative fair value allocation method. The pre-funded warrants are equity classified because they (i) are freestanding financial instruments that are legally detachable and separately exercisable from the equity instruments, (ii) are immediately exercisable, (iii) do not embody an obligation for the Company to repurchase its shares, (iv) permit the holders to receive a fixed number of shares of common stock upon exercise, (v) are indexed to the Company's common stock and (vi) meet the equity classification criteria. In addition, such pre-funded warrants do not provide any guarantee of value or return. The Company valued the pre-funded warrants at issuance, concluding that their sale price approximated their fair value, and allocated the aggregate net proceeds from the sale proportionately to the common stock and prefunded warrants, including approximately $24.6 million allocated to the pre-funded warrants and recorded as a component of additional paid-in capital. At-the-Market Equity Offering In February 2020, the Company entered into an Open Market Sale Agreement ("ATM Agreement") with Jefferies LLC, as agent (“Jefferies”), pursuant to which the Company may offer and sell, from time to time through Jefferies, shares of its common stock having an aggregate offering price of up to $100.0 million. Of the $100.0 million originally authorized for sale under the ATM Agreement, approximately $28.6 million were sold under the Company’s prior registration statement on Form S-3 (Registration No. 333-227182). An additional $51.9 million were sold under the Company's effective registration statement on Form S-3 (Registration Statement No. 333-259311), which included $20.1 million in the year ended December 31, 2022. The Company did not sell any shares under the ATM Agreement during the year ended December 31, 2023 or during the six months ended June 30, 2024. As of June 30, 2024, an aggregate of $19.5 million remained eligible for sale under the ATM Agreement.

- Definition

The entire disclosure for equity.

+ References

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+ Details

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Pre-funded common stock warrants, net of issuance costs	$ 1.6
Underwritten Equity Offering
Issuance costs	$ 12.6

SHARE-BASED COMPENSATION - Summary of Stock Option Issuances and Balances Outstanding (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Aggregate Intrinsic Value (in thousands)
Number of shares exercisable (in shares) \| shares	7,600,000
Weighted average exercise price (in dollars per share) \| $ / shares	$ 21.42
Stock Options
Shares Underlying Options
Beginning balance (in shares) \| shares	10,211,353
Granted (in shares) \| shares	1,524,300
Exercised (in shares) \| shares	0
Forfeited/canceled (in shares) \| shares	(1,217,047)
Ending balance (in shares) \| shares	10,518,606	10,211,353
Vested and expected to vest (in shares) \| shares	10,518,606
Weighted Average Exercise Price
Beginning balance (in dollars per share) \| $ / shares	$ 21.52
Granted (in dollars per share) \| $ / shares	8.63
Exercised (in dollars per share) \| $ / shares	0
Forfeited/canceled (in dollars per share) \| $ / shares	18.97
Ending balance (in dollars per share) \| $ / shares	19.95	$ 21.52
Vested and expected to vest (in dollars per share) \| $ / shares	$ 19.95
Weighted Average Remaining Contractual Life (years)	5 years 5 months 19 days	4 years 10 months 28 days
Vested and expected to vest	5 years 5 months 19 days
Aggregate Intrinsic Value (in thousands)
Aggregate intrinsic value, beginning balance \| $	$ 0
Aggregate intrinsic value, ending balance \| $	299,450	$ 0
Aggregate intrinsic value, vested and expected to vest \| $	299,450
Unamortized stock compensation expense \| $	$ 23,500
Weighted-average recognition period (in years)	2 years 8 months 12 days

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	20,000,000	20,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	200,000,000	200,000,000
Common stock, issued (in shares)	76,456,562	75,367,117
Common stock, outstanding (in shares)	76,456,562	75,367,117

NET LOSS PER COMMON SHARE

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

NET LOSS PER COMMON SHARE

Basic and diluted net income (loss) per common share is calculated by dividing net loss applicable to common stockholders by the weighted-average number of common shares outstanding during the period. In accordance with ASC 260, Earnings per Share, if a company had a discontinued operation, the company uses income from continuing operations, adjusted for preferred dividend and similar adjustments, as its control number to determine whether potential common shares are dilutive.

As discussed in Note 17, as part of its February 2023 underwritten public offering, the Company issued and sold pre-funded warrants to purchase 1.25 million shares of its common stock at a price to the public of $20.9999 per pre-funded warrant. The pre-funded warrants are exercisable immediately and are exercisable for one share of the Company's common stock. The exercise price of each pre-funded warrant is $0.0001 per share of common stock. Since the $0.0001 price per share represents little consideration and is non-substantive in relation to the $20.9999 price per pre-funded warrant and the $21.00 price per share of the common stock offered to the public, and as the warrants are immediately exercisable with no further vesting conditions or contingencies associated with them, the shares underlying the warrants are therefore included in the calculation of basic net loss per common share.

The Company’s potentially dilutive shares, which include outstanding stock options, restricted stock units, and shares issuable upon conversion of the 2025 Notes and 2029 Notes, are considered to be common stock equivalents and are not included in the calculation of diluted net loss per share because their effect is anti-dilutive.

Basic and diluted net income (loss) per share is calculated as follows (net loss amounts are stated in thousands):
























	Three Months Ended June 30,
	2024					2023
	Shares	Net Income (loss)		EPS		Shares	Net Income (loss)		EPS
Continuing operations	77,500,245	$	(69,652)	$	(0.90)	76,001,801	$	(101,932)	$	(1.34)
Discontinued operations	77,500,245	$	(757)	$	(0.01)	76,001,801	$	16,302	$	0.21
Basic and diluted loss per share	77,500,245	$	(70,409)	$	(0.91)	76,001,801	$	(85,630)	$	(1.13)


	Six Months Ended June 30,
	2024					2023
	Shares	Net Income (loss)		EPS		Shares	Net Income (loss)		EPS
Continuing operations	77,318,369	$	(205,610)	$	(2.66)	72,109,573	$	(198,496)	$	(2.75)
Discontinued operations	77,318,369	$	(860)	$	(0.01)	72,109,573	$	26,535	$	0.37
Basic and diluted loss per share	77,318,369	$	(206,470)	$	(2.67)	72,109,573	$	(171,961)	$	(2.38)

The following common stock equivalents have been excluded because they were anti-dilutive:


	Three Months Ended June 30,		Six Months Ended June 30,
	2024	2023	2024	2023
Convertible debt	11,697,952	11,697,952	11,697,952	11,697,952
Options	11,121,357	10,719,869	11,024,633	10,633,802
Restricted stock	4,073,280	3,626,814	3,921,208	3,453,767

Total anti-dilutive shares	26,892,589	26,044,635	26,643,793	25,785,521

FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

The Company utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2 – Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

The valuation techniques used to measure the fair value of the Company’s debt securities and all other financial instruments, all of which have counter-parties with high credit ratings, were valued based on quoted market prices or model driven valuations using significant inputs derived from or corroborated by observable market data. Based on the fair value hierarchy, the Company classified marketable debt securities within Level 2.

Financial instruments with carrying values approximating fair value include cash and cash equivalents, accounts receivable, and accounts payable, due to their short-term nature. As of June 30, 2024, the fair value of the Company's 2.5% Convertible Senior Notes due 2025 was $61.0 million and the fair value of the Company's 2.25% Convertible Senior Notes due 2029 was $201.9 million. As of December 31, 2023, the fair value of the Company's 2.5% Convertible Senior Notes due 2025 was $58.3 million and the fair value of the Company's 2.25% Convertible Senior Notes due 2029 was $212.1 million. The fair values were estimated utilizing market quotations and are considered Level 2.


	As of June 30, 2024
	Total carrying and estimated fair value		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	$	32,291	$	32,291	$	—	$	—
Marketable debt securities, available-for-sale	293,105		—		293,105		—
Total	$	325,396	$	32,291	$	293,105	$	—


	As of December 31, 2023
	Total carrying and estimated fair value		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	$	58,176	$	58,176	$	—	$	—
Marketable debt securities, available-for-sale	508,675		—		508,675		—
Total	$	566,851	$	58,176	$	508,675	$	—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Section 55
-Paragraph 107
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+ Details

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 32,291	$ 58,176
Marketable debt securities, at fair value	293,105	508,675
Accounts receivable, net	24,466	21,179
Inventory	5,976	9,410
Prepaid expenses and other current assets	13,139	19,335
Total current assets	368,977	616,775
Long-term inventory	37,004	31,494
Property and equipment, net	6,580	7,479
Operating lease right of use assets	16,467	18,061
Intangible assets, net	105,174	104,443
Other assets	16,919	10,661
Total assets	551,121	788,913
Current liabilities:
Accounts payable	25,843	41,675
Accrued expenses	79,641	118,991
Deferred revenue, current portion	5,378	7,096
Operating lease liabilities, current portion	5,163	4,909
Other current liabilities	5,243	5,237
Total current liabilities	121,268	177,908
Convertible debt	378,125	377,263
Deferred revenue, less current portion	0	1,835
Operating lease liabilities, less current portion	19,938	22,612
Other non-current liabilities	16,643	8,485
Total liabilities	535,974	588,103
Commitments and Contingencies (See Note 13)
Stockholders' Equity:
Preferred stock $0.0001 par value; 20,000,000 shares authorized; no shares issued and outstanding as of June 30, 2024 and December 31, 2023	0	0
Common stock $0.0001 par value; 200,000,000 shares authorized; 76,456,562, and 75,367,117 issued and outstanding as of June 30, 2024 and December 31, 2023, respectively	8	7
Additional paid-in capital	1,348,865	1,327,881
Accumulated deficit	(1,332,092)	(1,125,622)
Accumulated other comprehensive loss	(1,634)	(1,456)
Total stockholders' equity	15,147	200,810
Total liabilities and stockholders' equity	$ 551,121	$ 788,913

SHARE-BASED COMPENSATION - Summary of Performance Based Restricted Stock Activity (Details) - Performance Shares $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
Number of Restricted Stock Units
Beginning balance (in shares) \| shares	175,458
Granted (in shares) \| shares	107,000
Vested (in shares) \| shares	0
Forfeited/canceled (in shares) \| shares	0
Ending balance (in shares) \| shares	282,458
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 25.61
Granted (in dollars per share) \| $ / shares	8.93
Vested (in dollars per share) \| $ / shares	0
Forfeited/canceled (in dollars per share) \| $ / shares	0
Ending balance (in dollars per share) \| $ / shares	$ 19.29
Unamortized stock compensation expense \| $	$ 2.2
Weighted-average recognition period (in years)	1 year 1 month 6 days

MARKETABLE DEBT SECURITIES - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivable	$ 2.8	$ 4.6
Available-for-sale marketable debt securities in an unrealized loss position	$ 252.1	$ 269.7

FAIR VALUE MEASUREMENTS - Additional Information (Details) - Senior Notes - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Senior Notes Due 2025
Business Acquisition [Line Items]
Interest rate percentage	2.50%	2.50%
Fair value of convertible debt	$ 61.0	$ 58.3
Senior Notes Due 2029
Business Acquisition [Line Items]
Interest rate percentage	2.25%	2.25%
Fair value of convertible debt	$ 201.9	$ 212.1

DIVESTITURES - Summary Results, Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (loss) income from discontinued operations	$ (757)	$ 16,302	$ (860)	$ 26,535
Disposed of by Sale \| Bile Acid Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	(388)	27,501	(451)	53,606
Cost of goods sold	0	538		1,518
Cost of goods sold			(10)
Research and development	203	2,919	234	4,670
Selling, general and administrative	166	5,834	185	12,129
Change in fair value of contingent consideration	0	1,840	0	8,596
Total operating expenses	369	11,131	409	26,913
Operating (loss) income	(757)	16,370	(860)	26,693
Interest expense	0	(68)	0	(158)
Total other expense, net	0	(68)	0	(158)
Net (loss) income from discontinued operations	(757)	16,302	(860)	26,535
Net product sales \| Disposed of by Sale \| Bile Acid Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	$ (388)	$ 27,501	$ (451)	$ 53,606

REVENUE RECOGNITION - Summary of Net Product Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total net product sales	$ 54,116	$ 32,196	$ 95,490	$ 63,084
Net product sales
Disaggregation of Revenue [Line Items]
Total net product sales	52,176	29,511	92,160	53,689
FILSPARI
Disaggregation of Revenue [Line Items]
Total net product sales	27,125	3,461	46,959	6,465
Tiopronin products
Disaggregation of Revenue [Line Items]
Total net product sales	$ 25,051	$ 26,050	$ 45,201	$ 47,224

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Paragraph 41
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

MARKETABLE DEBT SECURITIES

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

MARKETABLE DEBT SECURITIES

The Company's marketable debt securities as of June 30, 2024 and December 31, 2023 were composed of available-for-sale commercial paper and corporate and government debt securities. The primary objective of the Company’s investment portfolio is to preserve capital and liquidity while enhancing overall returns. The Company’s investment policy limits interest-bearing security investments to certain types of instruments issued by institutions with primarily investment grade credit ratings and places restrictions on maturities and concentration by asset class and issuer.

Marketable debt securities consisted of the following (in thousands):


	June 30, 2024		December 31, 2023
Marketable debt securities:
Commercial paper	$	—	$	34,458
Corporate debt securities	228,320		368,323
Securities of government sponsored entities	64,785		105,894
Total available-for-sale marketable debt securities	$	293,105	$	508,675

The following is a summary of short-term marketable debt securities classified as available-for-sale as of June 30, 2024 (in thousands):


	Remaining Contractual Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Estimated Fair Value
Marketable debt securities:

Corporate debt securities	Less than 1	$	157,222	$	14	$	(369)	$	156,867
Securities of government-sponsored entities	Less than 1	64,931		2		(148)		64,785
Total maturity less than 1 year		222,153		16		(517)		221,652
Corporate debt securities	1 to 2	71,421		57		(25)		71,453

Total maturity 1 to 2 years		71,421		57		(25)		71,453
Total available-for-sale marketable debt securities		$	293,574	$	73	$	(542)	$	293,105

The following is a summary of short-term marketable debt securities classified as available-for-sale as of December 31, 2023 (in thousands):


	Remaining Contractual Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Estimated Fair Value
Marketable debt securities:
Commercial paper	Less than 1	$	34,450	$	25	$	(17)	$	34,458
Corporate debt securities	Less than 1	133,463		29		(408)		133,084
Securities of government-sponsored entities	Less than 1	81,334		36		(274)		81,096
Total maturity less than 1 year		249,247		90		(699)		248,638
Corporate debt securities	1 to 2	233,969		1,444		(174)		235,239
Securities of government-sponsored entities	1 to 2	24,718		106		(26)		24,798
Total maturity 1 to 2 years		258,687		1,550		(200)		260,037
Total available-for-sale securities		$	507,934	$	1,640	$	(899)	$	508,675

For the three and six months ended June 30, 2024 and 2023, realized gains and losses on marketable debt securities were immaterial. As of June 30, 2024 and December 31, 2023, the accrued interest receivable related to the Company's marketable debt securities was $2.8 million and $4.6 million, respectively, and was recorded in prepaid expenses and other current assets on the Consolidated Balance Sheets.

The Company reviews the available-for-sale marketable debt securities for declines in fair value below the cost basis each quarter. For any security whose fair value is below its amortized cost basis, the Company first evaluates whether it intends to sell the impaired security, or will otherwise be more likely than not required to sell the security before recovery. If either are true, the amortized cost basis of the security is written down to its fair value at the reporting date. If neither circumstance holds true, the Company assesses whether any portion of the unrealized loss is a result of a credit loss. Any amount deemed to be attributable to credit loss is recognized in the income statement, with the amount of the loss limited to the difference between fair value and amortized cost and recorded as an allowance for credit losses. The portion of the unrealized loss related to factors other than credit losses is recognized in other comprehensive income (loss).

The following is a summary of available-for-sale marketable debt securities in an unrealized loss position with no credit losses reported as of June 30, 2024 (in thousands):


	Less Than 12 Months				12 Months or Greater				Total
Description of Securities	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses

Corporate debt securities	$	108,950	$	128	$	82,756	$	266	$	191,706	$	394
Securities of government-sponsored entities	14,923		1		44,902		147		59,825		148
Total	$	123,873	$	129	$	127,658	$	413	$	251,531	$	542

The following is a summary of available-for-sale marketable debt securities in an unrealized loss position with no credit losses reported as of December 31, 2023 (in thousands):


	Less Than 12 Months				12 Months or Greater				Total
Description of Securities	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Commercial paper	$	24,798	$	17	$	—	$	—	$	24,798	$	17
Corporate debt securities	140,802		405		28,775		177		169,577		582
Securities of government-sponsored entities	61,933		217		12,540		83		74,473		300
Total	$	227,533	$	639	$	41,315	$	260	$	268,848	$	899

As of June 30, 2024 and December 31, 2023, the amortized cost of the available-for-sale marketable debt securities in an unrealized loss position was $252.1 million and $269.7 million, respectively.

As of June 30, 2024 and December 31, 2023, the Company does not intend to sell these investments and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost basis. The decrease in unrealized losses for the six months ended June 30, 2024 was primarily due to fluctuations in short-term interest rates. The Company does not believe the unrealized losses incurred during the period are due to credit-related factors. The credit ratings of the securities held remain of the highest quality. Moreover, the Company continues to receive payments of interest and principal as they become due, and our expectation is that those payments will continue to be received timely. Factors unknown to us at this time may cause actual results to differ and require adjustments to the Company’s estimates and assumptions in the future.

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2024

Accounting Policies [Abstract]

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

The accompanying unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 20, 2024. The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information, the instructions for Form 10-Q and the rules and regulations of the SEC. Accordingly, since they are interim statements, the accompanying consolidated financial statements do not include all of the information and notes required by GAAP for annual financial statements, but reflect all adjustments consisting of normal, recurring adjustments, that are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented. Interim results are not necessarily indicative of the results that may be expected for any future periods. The December 31, 2023 balance sheet information was derived from the audited financial statements as of that date. Certain reclassifications have been made to the prior period consolidated financial statements to conform to the current period presentation, including reclassifying the prior period revenues and expenses attributable to the bile acid business as net income from discontinued operations. These reclassifications did not have an impact on total assets or total liabilities in the Consolidated Balance Sheets or net loss in the Consolidated Statements of Operations.

A summary of the significant accounting policies applied in the preparation of the accompanying consolidated financial statements follows:

Principles of Consolidation

The unaudited consolidated financial statements represent the consolidation of the accounts of the Company, its subsidiaries and variable interest entities for which the Company has been determined to be the primary beneficiary, in conformity with accounting principles generally accepted in the United States ("U.S. GAAP"). All intercompany accounts and transactions have been eliminated in consolidation. See Note 6 for further discussion of variable interest entities (“VIE”) that the Company consolidates.

Revenue Recognition

The Company recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers ("ASC 606"), the entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The Company only recognizes revenue from contracts when it is probable that the entity will collect substantially all the consideration it is entitled to in exchange for the goods or services it transfers to the customer. See Note 3 and Note 4 for further discussion.

Payments received under collaboration and licensing agreements may include non-refundable fees at the inception of the arrangements, milestone payments for specific achievements and royalties on the sale of products. At the inception of arrangements that include milestone payments, the Company uses judgment to evaluate whether the milestones are probable of being achieved and estimates the amount to include in the transaction price utilizing the most likely amount method. If it is probable that a significant revenue reversal will not occur, the estimated amount is included in the transaction price. Milestone payments that are not within the Company or the licensee’s control, such as regulatory approvals, are considered to be constrained due to a high degree of uncertainty and are not included in the transaction price until such uncertainty is resolved. At the end of each reporting period, the Company re-evaluates the probability of achievement of development milestones and any related constraint and adjusts the estimate of the overall transaction price, if necessary. The Company recognizes aggregate sales-based milestones and royalty payments from product sales of which the license is deemed to be the predominant item to which the royalties relate, at the later of when the related sales occur or when the performance obligation to which the sales-based milestone or royalty has been allocated has been satisfied. Revenue from collaboration and licensing agreements may also include sales of inventory, at cost plus a margin, which is recorded in license and collaboration revenue.

The Company utilizes significant judgment to develop estimates of the stand-alone selling price for each distinct performance obligation based upon the relative stand-alone selling price. Variable consideration that relates specifically to the Company’s efforts to satisfy specific performance obligations is allocated entirely to those performance obligations. The stand-alone selling price for license-related performance obligations requires judgment in developing assumptions to project probability-weighted cash flows based upon estimates of forecasted revenues, clinical and regulatory timelines and discount rates. The stand-alone selling price for clinical development performance obligations is based on forecasted expected costs of satisfying a performance obligation plus an appropriate margin.

If the licenses to intellectual property are determined to be distinct from the other performance obligations identified in the arrangement and have stand-alone functionality, the Company recognizes revenues from non-refundable, upfront fees allocated to the license when the license is transferred to the licensee and the licensee is able to benefit from the license. For licenses that are not distinct from other promises, the Company applies judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees. The Company evaluates the measure of progress each reporting period and, if necessary, adjusts the related revenue recognition accordingly.

The selection of the method to measure progress towards completion requires judgment and is based on the nature of the products or services to be provided. Revenue is recorded proportionally as costs are incurred. The Company generally utilizes the cost-to-cost method of progress because it best measures the transfer of control to the customer which occurs as the Company incurs costs. Under the cost-to-cost measure of progress, the extent of progress towards completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. The Company uses judgment to estimate the total costs expected to complete the clinical development performance obligations, which include subcontractor costs, labor, materials, other direct costs and an allocation of indirect costs. The Company evaluates these cost estimates and the progress each reporting period and adjusts the measure of progress, if necessary.

Cost of goods sold

Cost of goods sold includes the cost of inventory sold, third party manufacturing and supply chain costs, product shipping and handling costs, and provisions for excess and obsolete inventory. Cost of goods sold also includes the cost of goods sold under the Company's license and collaboration agreements, which currently consists of the sale of active pharmaceutical ingredients to the Company's collaboration partners, at cost or at cost plus a margin.

The following table summarizes cost of goods sold for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Cost of goods sold - product sales	$	1,929	$	1,445	$	3,433	$	2,553
Cost of goods sold - license and collaboration	132		7		132		3,044
Total cost of goods sold	$	2,061	$	1,452	$	3,565	$	5,597

Capitalization of Inventory Costs

Prior to the regulatory approval of the Company's drug candidates, the Company incurs expenses for the manufacture of drug product supplies to support clinical development that could potentially be available to support the commercial launch of those drugs. The Company capitalizes inventory costs associated with its products after regulatory approval, when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized. Until the date at which regulatory approval has been received, costs related to the production of inventory are recorded as research and development expenses as incurred. Any eventual sale of previously expensed ("zero-cost") inventories may impact future margins, for any periods in which those inventories are sold.

Prior to the February 2023 FDA accelerated approval of FILSPARI (sparsentan), the Company expensed the production of active pharmaceutical ingredients purchased to support the commercial launch of FILSPARI, in research and development expenses. For the three and six months ended June 30, 2024 and 2023, sales of FILSPARI primarily consisted of zero-cost inventories. As of June 30, 2024, the Company had approximately $3.5 million of zero-cost inventory. The Company expects to continue to record zero cost of goods sold on the sale of previously expensed inventories through at least 2025. The Company began capitalizing inventory costs associated with FILSPARI following the February 2023 accelerated approval.

Research and Development Expenses

Research and development includes expenses related to sparsentan, pegtibatinase, and the Company's other pipeline programs. The Company expenses all research and development costs as they are incurred. The Company's research and development costs are composed of salaries and bonuses, benefits, share-based compensation, license fees, milestones under license agreements, costs paid to third-party contractors to perform research, conduct clinical trials, costs to develop drug materials and delivery devices, costs to manufacture drug product supplies to support clinical development, and associated overhead expenses and facilities costs. The Company charges direct internal and external program costs to the respective development programs. The Company also incurs indirect costs that are not allocated to specific programs because such costs benefit multiple development programs and allow us to increase our pharmaceutical development capabilities. These consist of internal shared resources related to the development and maintenance of systems and processes applicable to all of our programs.

Nonrefundable advance payments for goods and services to be received in the future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related goods are delivered or the services are performed, or when it is no longer expected that the goods will be delivered or the services rendered.

Clinical Trial Expenses

The Company records expenses in connection with its clinical trials under contracts with contract research organizations ("CROs") that support conducting and managing clinical trials, as well as contract manufacturing organizations ("CMOs") for the manufacture of drug product supplies to support clinical development. The financial terms and activities of these agreements vary from contract to contract and may result in uneven expense levels. Generally, these agreements set forth activities that drive the recording of expenses such as start-up, initiation activities, enrollment, treatment of patients, or the completion of other clinical trial activities, and in the case of CMOs, costs associated with the production of drug product supplied and the procurement of raw materials to be consumed in the manufacturing process.

Expenses related to clinical trials are accrued based on our estimates of the progress of services performed, including actual level of patient enrollment, completion of patient studies and progress of the clinical trials or the delivery of goods. Other incidental costs related to patient enrollment or treatment are accrued when reasonably certain. If the amounts we are obligated to pay under our clinical trial agreements are modified (for instance, as a result of changes in the clinical trial protocol or scope of work to be performed), the Company adjusts its estimates accordingly on a prospective basis. Revisions to the Company's contractual payment obligations are charged to expense in the period in which the facts that give rise to the revision become reasonably certain.

The Company currently has one Phase 1/2 clinical trial, two Phase 2 clinical trials and three Phase 3 clinical trials in process that are in varying stages of activity, with ongoing non-clinical support trials. As such, clinical trial expenses will vary depending on all the factors set forth above and may fluctuate significantly from quarter to quarter.

Intangible Assets with Cost Accumulation Model

In 2014, the Company entered into a license agreement with Mission Pharmacal in which the Company obtained the exclusive right to license the trademark of Thiola. The acquisition of the Thiola license qualified as an asset acquisition under the principles of ASC 805, Business Combinations ("ASC 805") in effect at the time of acquisition. The license agreement requires the Company to make royalty payments based on net sales of Thiola. The liability for royalties in excess of the annual contractual minimum is recognized in the period in which the royalties become probable and estimable, which is typically in the period corresponding with the respective sales. The Company records an offsetting increase to the cost basis of the asset under the cost accumulation model ("Thiola Intangible"). The additional cost basis is subsequently amortized over the remaining useful life.

In the second quarter of 2023, the Company reduced the estimated useful life of the Thiola Intangible to better reflect the pattern of projected future cash flows. The change in estimated useful life was accounted for as a change in accounting estimate with the remaining carrying amounts of the Thiola Intangible being amortized prospectively over the new useful life.

Consistent with all prior periods since Thiola was acquired, the Company has not accrued any liability for future royalties in excess of the annual contractual minimum at June 30, 2024 as such royalties are not yet probable and estimable.

Variable Interest Entity

The Company reviews each investment and collaboration agreement to determine if it has a variable interest in the entity. In assessing whether the Company has a variable interest in the entity as a whole, the Company considers and makes judgments regarding the purpose and design of the entity, the value of the licensed assets to the entity, the value of the entity’s total assets and the significant activities of the entity. If the Company has a variable interest in the entity as a whole, the Company assesses whether or not the Company is a primary beneficiary of that VIE, based on a number of factors, including: (i) which party has the power to direct the activities that most significantly affect the VIE’s economic performance, (ii) the parties’ contractual rights and responsibilities pursuant to the collaboration agreement, and (iii) which party has the obligation to absorb losses of or the right to receive benefits from the VIE that could be significant to the VIE. If the Company determines that it is the primary beneficiary of a VIE at the onset of the collaboration, the collaboration is treated as a business combination and the Company consolidates the financial statements of the VIE into the Company’s consolidated financial statements. On a quarterly basis, the Company evaluates whether it continues to be the primary beneficiary of the consolidated VIE. If the Company determines that it is no longer the primary beneficiary of a consolidated VIE, it deconsolidates the VIE in the period in which the determination is made.

Assets and liabilities recorded as a result of consolidating the financial results of the VIE into the Company’s consolidated balance sheet do not represent additional assets that could be used to satisfy claims against the Company’s general assets or liabilities for which creditors have recourse to the Company’s general assets.

Equity Securities

The Company applies the equity method of accounting for investments when it has significant influence, but no controlling interest in the investee. Judgment regarding the level of influence over each equity method investment includes key factors such as ownership interest, representation on the board of directors, participation in joint steering committees and material intercompany transactions. The Company evaluates any basis difference between the carrying value and fair value of the Company's proportionate share of the investee's net assets. Basis differences relating to in-process research and development (IPR&D) are expensed when the investee is not considered a business as defined in ASC 805, Business Combinations, due to substantially all of the estimated fair value of the gross assets being concentrated in a group of similar IPR&D assets with no alternative future use. For the three and six months ending June 30, 2024, the Company recognized $3.4 million in other expense in the Company's consolidated statements of operations for these basis adjustments. The equity method investment's carrying value was reduced to zero as the Company's proportionate share of the basis difference exceeded the carrying value. See Note 6 for further discussion. Investments accounted for using the equity method may be reported on a lag of up to three months if the financial statements of the investee are not available in sufficient time for the Company to apply the equity method as of the current reporting date.

Discontinued Operations

Discontinued operations is presented when there is a disposal of a component or a group of components that in the Company's judgment represents a strategic shift that will have a major effect on the Company's operations and financial results. Results of operations directly related to discontinued operations are aggregated into a single line item in the Consolidated Statements of Operations for all periods presented. See Note 18 for further discussion.

Restructuring

Restructuring charges consist primarily of employee severance, one-time termination benefits related to the reduction of its workforce, and other costs. Liabilities for costs associated with a restructuring activity are recognized when the liability is incurred and are measured at fair value. One-time termination benefits are expensed at the date the entity notifies the employee, unless the employee must provide future service, in which case the benefits are expensed ratably over the service period. Termination benefits are calculated based on regional benefit practices and local statutory requirements.

In December 2023, the Company initiated a restructuring plan that resulted in a reduction of its workforce, primarily impacting non-field-based employees. One-time termination benefits include severance, continuation of health insurance coverage, and other benefits for a specified period of time. The Company estimated that it will incur a total of $12.0 million to $14.0 million in non-recurring charges in connection with the restructuring, of which the Company has recognized a total of $12.3 million as of June 30, 2024, including $0.7 million and $0.9 million for the three and six months ended June 30, 2024, respectively. As of June 30, 2024 and December 31, 2023, the Company had accruals related to the restructuring of $1.1 million and $11.4 million, respectively, which is included in accrued expenses in the Consolidated Balance Sheets. Cash payments totaling $11.3 million were made related to the restructuring during 2024. The Company expects that it will incur the remaining estimated restructuring costs during 2024. The Company anticipates it will pay all restructuring plan amounts during 2024.

The following table sets forth a summary of changes in accrued restructuring costs for the six months ended June 30, 2024 and 2023 (in thousands):


	Restructuring
	2024		2023
Liability balance at January 1,	$	11,421	$	—
Restructuring expenses	912		—
Payments	(11,313)		—
Foreign currency impact	34		—
Liability balance at June 30,	$	1,054	$	—

Recently Adopted Accounting Pronouncements

In November 2023, the FASB issued ASU No. 2023-07, Improvements to Reportable Segment Disclosure. The FASB amended the guidance in ASC 280, Segment Reporting ("ASC 280"), to require a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment's profit or loss and assets that are currently required annually. Public entities with a single reportable segment are required to provide the new disclosures and all the disclosures required under ASC 280. The guidance is applied retrospectively to all periods presented in financial statements, unless it is impracticable. This new guidance is effective for public business entities for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company adopted this new standard as of January 1, 2024, however, the adoption did not have an impact on the accompanying quarterly financial statements since the standard is not effective for interim periods until fiscal 2025. While this accounting standard will increase disclosures, it will not have a material impact on the Company's financial statements.

Recently Issued Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board ("FASB") or other standard setting bodies. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its consolidated financial position or results of operations upon adoption.

In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures. This new standard does not change accounting for income taxes but requires new disclosures focusing on two areas, the effective rate reconciliation and taxes paid. This new standard is effective for public business entities for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company expects to adopt this new standard beginning in fiscal 2025 when it becomes effective.

DIVESTITURES - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Aug. 31, 2023	Jun. 30, 2024	Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition services accruals, current		$ 0.3	$ 0.3
Disposed of by Sale \| Bile Acid Product Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 210.0
Consideration receivable on sale of business (up to)	235.0
Gain on disposal of discontinued operations, net of tax	$ 226.0
Discontinued operation, intra-entity amounts, discontinued operation after disposal, expense		$ 0.1	$ 0.5
Discontinued operation, period of continuing involvement after disposal	12 months
Disposed of by Sale \| Bile Acid Product Portfolio \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Milestone thresholds	$ 125.0
Disposed of by Sale \| Bile Acid Product Portfolio \| Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Milestone thresholds	$ 500.0

SHARE-BASED COMPENSATION

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

SHARE-BASED COMPENSATION

Stock Options

The following table summarizes stock option activity during the six months ended June 30, 2024:


	Shares Underlying Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2023	10,211,353	$	21.52	4.91	$	—
Granted	1,524,300	8.63		—	—
Exercised	—	—		—	—
Forfeited/canceled	(1,217,047)	18.97		—	—
Outstanding at June 30, 2024	10,518,606	$	19.95	5.47	$	299,450
Vested and expected to vest at June 30, 2024	10,518,606	$	19.95	5.47	$	299,450

At June 30, 2024, unamortized stock compensation for stock options was $23.5 million, with a remaining weighted-average recognition period of 2.7 years.

At June 30, 2024, outstanding options to purchase 7.6 million shares of common stock were exercisable with a weighted-average exercise price per share of $21.42. During the six months ended June 30, 2024, the Company had forfeitures of 1.2 million shares due primarily to the December 2023 reorganization.

Restricted Stock Units

Service Based Restricted Stock Units

The following table summarizes the Company’s service based restricted stock unit activity during the six months ended June 30, 2024:


	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2023	2,874,046	$	22.97
Granted	1,962,025	8.84
Vested	(849,945)	23.06
Forfeited/canceled	(246,050)	20.18
Unvested at June 30, 2024	3,740,076	$	15.72

At June 30, 2024, unamortized stock compensation for service based restricted stock units was $48.0 million, with a remaining weighted-average recognition period of 2.8 years.

Performance Based Restricted Stock Units

The following table summarizes the Company’s performance based restricted stock unit activity during the six months ended June 30, 2024:


	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2023	175,458	$	25.61
Granted	107,000	8.93
Vested	—	—
Forfeited/canceled	—	—
Unvested at June 30, 2024	282,458	$	19.29

At June 30, 2024, unamortized stock compensation for performance based restricted stock units was $2.2 million, with a remaining weighted-average recognition period of 1.1 years.

Share-Based Compensation

Total share-based compensation presented in the Consolidated Statements of Stockholders' Equity includes both continuing operations and discontinued operations. The following table sets forth share-based compensation for continuing operations for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Research and development	$	3,774	$	4,568	$	7,431	$	9,001
Selling, general and administrative	6,146		6,743		12,246		15,781
Total share-based compensation	$	9,920	$	11,311	$	19,677	$	24,782

BASIS OF PRESENTATION AND SIGNIFICANT ACCCOUNTING POLICIES - Summary of Restructuring and Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Reserve [Roll Forward]
Liability balance at January 1,			$ 11,421	$ 0
Restructuring expenses	$ 653	$ 0	912	0
Payments			(11,313)	0
Foreign currency impact			34	0
Liability balance at June 30,	$ 1,054	$ 0	$ 1,054	$ 0

COLLABORATION AND LICENSE AGREEMENTS (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 15, 2021 USD ($) performance_obligation	Jan. 31, 2024 USD ($) performance_obligation	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue			$ 54,116	$ 32,196	$ 95,490	$ 63,084
Deferred revenue, current portion			5,378		5,378			$ 7,096
Vifor Pharma \| License and Collaboration
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue			1,900	$ 2,700	3,300	$ 9,400
Collaborative Arrangement \| Vifor Pharma
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment	$ 55,000
Maximum milestone payments from collaborator	$ 845,000
Percentage of royalty on net sales receives up to	40.00%
Force majeure event period threshold	6 months
Revenue	$ 55,000
Number of performance obligations \| performance_obligation	2
Deferred revenue	$ 43,000		$ 5,400		$ 5,400			8,900
Deferred revenue, current portion								$ 7,100
Collaborative Arrangement \| Vifor Pharma \| Regulatory and Market Access Milestone
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments from collaborator	135,000
Collaborative Arrangement \| Vifor Pharma \| Sales-based Milestone Payments
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments from collaborator	$ 655,000
Collaborative Arrangement \| Vifor Pharma \| License and Collaboration
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue							$ 12,000
Collaborative Arrangement \| Renalys Pharma Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Force majeure event period threshold		9 months
Revenue		$ 8,300
Number of performance obligations \| performance_obligation		1
Collaborative Arrangement \| Renalys Pharma Inc \| Regulatory Development And Sales Based Milestone
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum milestone payments from collaborator		$ 120,000

SHARE-BASED COMPENSATION - Summary of Share Based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 9,920	$ 11,311	$ 19,677	$ 24,782
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	3,774	4,568	7,431	9,001
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 6,146	$ 6,743	$ 12,246	$ 15,781

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480483/718-10-35-1D

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows From Operating Activities:
Net loss	$ (206,470)	$ (171,961)
Net (loss) income from discontinued operations	(860)	26,535
Net loss from continuing operations	(205,610)	(198,496)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	20,225	17,567
Share based compensation	19,677	24,781
In-process research and development	65,205	0
Other	5,350	(2,727)
Changes in operating assets and liabilities:
Accounts receivable	(3,286)	(4,080)
Inventory	(3,240)	(12,261)
Prepaid expenses and other current and non-current assets	(1,858)	452
Accounts payable	(15,641)	3,311
Accrued expenses	(41,172)	(7,305)
Deferred revenue, current and non-current	(3,643)	(6,823)
Other current and non-current liabilities	5,157	(975)
Net cash used in operating activities - continuing operations	(158,836)	(186,556)
Net cash (used in) provided by operating activities - discontinued operations	(412)	36,142
Net cash used in operating activities	(159,248)	(150,414)
Cash Flows From Investing Activities:
Proceeds from the sale and maturity of marketable debt securities	216,967	196,871
Purchase of marketable debt securities	0	(225,660)
Purchase of fixed assets	(82)	(633)
Purchase of intangible assets	(18,377)	(31,170)
Payment of milestone	(65,000)	0
Net cash provided by (used in) investing activities - continuing operations	133,508	(60,592)
Cash Flows From Financing Activities:
Payment of guaranteed minimum royalty	(1,050)	(1,050)
Proceeds from the issuance of pre-funded warrants, net of issuance costs	0	24,630
Proceeds from exercise of stock options	0	3,089
Proceeds from issuances under the employee stock purchase plan	1,307	2,258
Net cash provided by financing activities - continuing operations	257	220,125
Net cash used in financing activities - discontinued operations	0	(863)
Net cash provided by financing activities	257	219,262
Effect of exchange rate changes on cash	(402)	930
Net (decrease) increase in cash and cash equivalents	(25,885)	9,186
Cash and cash equivalents, beginning of year	58,176	61,688
Cash and cash equivalents, end of period	32,291	70,874
Underwritten Equity Offering
Cash Flows From Financing Activities:
Proceeds from the issuance of common stock, net of issuance costs	$ 0	$ 191,198

MARKETABLE DEBT SECURITIES (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Summary of Marketable Debt Securities

Marketable debt securities consisted of the following (in thousands):


	June 30, 2024		December 31, 2023
Marketable debt securities:
Commercial paper	$	—	$	34,458
Corporate debt securities	228,320		368,323
Securities of government sponsored entities	64,785		105,894
Total available-for-sale marketable debt securities	$	293,105	$	508,675

Summary of Short-term Marketable Debt Securities Classified as Available-for-sale

The following is a summary of short-term marketable debt securities classified as available-for-sale as of June 30, 2024 (in thousands):


	Remaining Contractual Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Estimated Fair Value
Marketable debt securities:

Corporate debt securities	Less than 1	$	157,222	$	14	$	(369)	$	156,867
Securities of government-sponsored entities	Less than 1	64,931		2		(148)		64,785
Total maturity less than 1 year		222,153		16		(517)		221,652
Corporate debt securities	1 to 2	71,421		57		(25)		71,453

Total maturity 1 to 2 years		71,421		57		(25)		71,453
Total available-for-sale marketable debt securities		$	293,574	$	73	$	(542)	$	293,105

The following is a summary of short-term marketable debt securities classified as available-for-sale as of December 31, 2023 (in thousands):


	Remaining Contractual Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Estimated Fair Value
Marketable debt securities:
Commercial paper	Less than 1	$	34,450	$	25	$	(17)	$	34,458
Corporate debt securities	Less than 1	133,463		29		(408)		133,084
Securities of government-sponsored entities	Less than 1	81,334		36		(274)		81,096
Total maturity less than 1 year		249,247		90		(699)		248,638
Corporate debt securities	1 to 2	233,969		1,444		(174)		235,239
Securities of government-sponsored entities	1 to 2	24,718		106		(26)		24,798
Total maturity 1 to 2 years		258,687		1,550		(200)		260,037
Total available-for-sale securities		$	507,934	$	1,640	$	(899)	$	508,675

Summary of Marketable Debt Securities in an Unrealized Loss Position

The following is a summary of available-for-sale marketable debt securities in an unrealized loss position with no credit losses reported as of June 30, 2024 (in thousands):


	Less Than 12 Months				12 Months or Greater				Total
Description of Securities	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses

Corporate debt securities	$	108,950	$	128	$	82,756	$	266	$	191,706	$	394
Securities of government-sponsored entities	14,923		1		44,902		147		59,825		148
Total	$	123,873	$	129	$	127,658	$	413	$	251,531	$	542

The following is a summary of available-for-sale marketable debt securities in an unrealized loss position with no credit losses reported as of December 31, 2023 (in thousands):


	Less Than 12 Months				12 Months or Greater				Total
Description of Securities	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Commercial paper	$	24,798	$	17	$	—	$	—	$	24,798	$	17
Corporate debt securities	140,802		405		28,775		177		169,577		582
Securities of government-sponsored entities	61,933		217		12,540		83		74,473		300
Total	$	227,533	$	639	$	41,315	$	260	$	268,848	$	899

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

CONVERTIBLE NOTES PAYABLE - Summary of Long-term Debt Instruments (Details) - Senior Notes - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total convertible senior notes, net of unamortized debt discount and debt issuance costs	$ 378,125	$ 377,263
Senior Notes Due 2029
Debt Instrument [Line Items]
Interest rate percentage	2.25%	2.25%
Convertible senior notes	$ 316,250	$ 316,250
Unamortized debt issuance costs	$ (6,645)	$ (7,348)
Senior Notes Due 2025
Debt Instrument [Line Items]
Interest rate percentage	2.50%	2.50%
Convertible senior notes	$ 68,904	$ 68,904
Unamortized debt issuance costs	$ (384)	$ (543)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		150 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Payments to date under terms of agreement		$ 18,377	$ 31,170
Goodwill	$ 800	800		$ 800	$ 800
Ligand License Agreement
Finite-Lived Intangible Assets [Line Items]
Substantial payments payable upon achievement of milestones	114,100	114,100		114,100
Payments to date under terms of agreement	5,800	$ 5,800		$ 47,200
Ligand License Agreement \| Minimum
Finite-Lived Intangible Assets [Line Items]
Annual royalty percentage		15.00%
Ligand License Agreement \| Maximum
Finite-Lived Intangible Assets [Line Items]
Annual royalty percentage		17.00%
Royalty Agreements
Finite-Lived Intangible Assets [Line Items]
Payments to date under terms of agreement	$ 4,100	$ 7,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

COMMITMENTS AND CONTINGENCIES	6 Months Ended
COMMITMENTS AND CONTINGENCIES	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Commitments Certain of the Company's contractual arrangements with contract manufacturing organizations ("CMOs") require binding forecasts or commitments to purchase minimum amounts for the manufacture of drug product supply, which may be material to the Company's financial statements. Contingencies In November 2020, the Company completed the acquisition of Orphan Technologies Limited (“Orphan”), including Orphan’s rare metabolic disorder drug pegtibatinase. The Company acquired Orphan by purchasing all of the outstanding shares. Under the Agreement, the Company has also agreed to make contingent cash payments up to an aggregate of $427.0 million based on the achievement of certain development, regulatory and commercialization events as set forth in the Agreement, as well as additional tiered mid-single digit royalty payments based upon future net sales of any pegtibatinase products in the US and Europe, subject to certain reductions as set forth in the Agreement, and a contingent payment in the event a pediatric rare disease voucher for any pegtibatinase product is granted. Substantially all of the value of the assets acquired was concentrated within pegtibatinase, and as of the acquisition date, the Company did not anticipate any economic benefit to be derived from pegtibatinase other than the primary indication. Accordingly, the transaction was treated as an asset acquisition with amounts charged to in-process research and development (IPR&D) expense on the date of acquisition. In accordance with ASC 450, Contingencies, contingent cash payments will be accrued for when it is probable that a liability has been incurred and the amount can be reasonably estimated. In March 2024, the Company recognized $65.2 million in IPR&D expense upon the achievement of a development milestone, which was paid during the second quarter of 2024 and recorded within investing activities in the Consolidated Statements of Cash Flows. Legal Proceedings From time to time in the normal course of business, the Company is subject to various legal matters such as threatened or pending claims or litigation. Although the results of claims and litigation cannot be predicted with certainty, the Company does not believe it is a party to any claim or litigation in which the outcome, if determined adversely to it, would individually or in the aggregate be reasonably expected to have a material adverse effect on its results of operations or financial condition.

FAIR VALUE MEASUREMENTS - Summary of Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Cash and cash equivalents	$ 32,291	$ 58,176
Marketable debt securities, available-for-sale	293,105	508,675
Total	325,396	566,851
Quoted prices in active markets (Level 1)
Assets:
Cash and cash equivalents	32,291	58,176
Marketable debt securities, available-for-sale	0	0
Total	32,291	58,176
Significant other observable inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Marketable debt securities, available-for-sale	293,105	508,675
Total	293,105	508,675
Significant unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Marketable debt securities, available-for-sale	0	0
Total	$ 0	$ 0

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

+ Details

SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

Summary of Stock Option Issuances and Balances Outstanding

The following table summarizes stock option activity during the six months ended June 30, 2024:


	Shares Underlying Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2023	10,211,353	$	21.52	4.91	$	—
Granted	1,524,300	8.63		—	—
Exercised	—	—		—	—
Forfeited/canceled	(1,217,047)	18.97		—	—
Outstanding at June 30, 2024	10,518,606	$	19.95	5.47	$	299,450
Vested and expected to vest at June 30, 2024	10,518,606	$	19.95	5.47	$	299,450

Summary of Service Based Restricted Stock Activity

The following table summarizes the Company’s service based restricted stock unit activity during the six months ended June 30, 2024:


	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2023	2,874,046	$	22.97
Granted	1,962,025	8.84
Vested	(849,945)	23.06
Forfeited/canceled	(246,050)	20.18
Unvested at June 30, 2024	3,740,076	$	15.72

Summary of Performance Based Restricted Stock Activity

The following table summarizes the Company’s performance based restricted stock unit activity during the six months ended June 30, 2024:


	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2023	175,458	$	25.61
Granted	107,000	8.93
Vested	—	—
Forfeited/canceled	—	—
Unvested at June 30, 2024	282,458	$	19.29

Summary of Share Based Compensation Expenses

The following table sets forth share-based compensation for continuing operations for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Research and development	$	3,774	$	4,568	$	7,431	$	9,001
Selling, general and administrative	6,146		6,743		12,246		15,781
Total share-based compensation	$	9,920	$	11,311	$	19,677	$	24,782

CONVERTIBLE NOTES PAYABLE - Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Mar. 11, 2022 USD ($)	Sep. 10, 2018 USD ($)	Jun. 30, 2024 USD ($) $ / shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) day $ / shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023
Debt Instrument [Line Items]
Debt instrument, repurchase amount Including accrued and unpaid interest	$ 213,800
Loss on extinguishment of debt						$ 7,600
Write off of deferred debt financing costs						3,400
Interest expense recognized			$ 2,788	$ 2,843	$ 5,588	$ 5,693
Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt, excluding current maturities	316,300
Interest rate percentage			2.25%		2.25%		2.25%
Proceeds from issuance of debt	306,400
Debt issuance costs, net	9,900		$ 9,900		$ 9,900
Accrued interest			$ 2,400		$ 2,400
Debt instrument, convertible, threshold percentage of stock price trigger					130.00%
Conversion ratio					0.031374
Conversion price (in dollars per share) \| $ / shares			$ 31.87		$ 31.87
Notes payable			$ 100,000		$ 100,000
Long-term debt, term			7 years		7 years
Effective interest percentage			2.74%		2.74%
Senior Notes \| Senior Notes Due 2029 \| Debt Conversion, Scenario One
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| day					20
Debt instrument, convertible, threshold consecutive trading days \| day					30
Debt instrument, convertible, threshold percentage of stock price trigger					130.00%
Senior Notes \| Senior Notes Due 2029 \| Debt Conversion, Scenario Two
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| day					5
Debt instrument, convertible, threshold consecutive trading days \| day					10
Debt instrument, convertible, threshold percentage of stock price trigger					98.00%
Senior Notes \| Senior Notes Due 2029, Issued Pursuant to Underwriters Option
Debt Instrument [Line Items]
Long-term debt, excluding current maturities	41,300
Senior Notes \| Senior Notes Due 2025
Debt Instrument [Line Items]
Long-term debt, excluding current maturities		$ 276,000
Interest rate percentage			2.50%		2.50%		2.50%
Proceeds from issuance of debt		267,200
Debt issuance costs, net		$ 8,800
Accrued interest			$ 500		$ 500
Debt instrument, convertible, threshold percentage of stock price trigger					130.00%
Conversion ratio					0.0257739
Conversion price (in dollars per share) \| $ / shares			$ 38.80		$ 38.80
Long-term debt, term			7 years		7 years
Effective interest percentage			2.98%		2.98%
Debt instrument, repurchase amount	$ 207,100
Long-term debt, excluding current maturities, repaid if converted			$ 68,900		$ 68,900
Senior Notes \| Senior Notes Due 2025 \| Debt Conversion, Scenario One
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| day					20
Debt instrument, convertible, threshold consecutive trading days \| day					30
Debt instrument, convertible, threshold percentage of stock price trigger					130.00%
Senior Notes \| Senior Notes Due 2025 \| Debt Conversion, Scenario Two
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| day					5
Debt instrument, convertible, threshold consecutive trading days \| day					10
Debt instrument, convertible, threshold percentage of stock price trigger					98.00%

NET LOSS PER COMMON SHARE - Summary of Common Stock Options, Convertible Debt and Restricted Stock Units Anti-dilutive (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	26,892,589	26,044,635	26,643,793	25,785,521
Convertible debt
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	11,697,952	11,697,952	11,697,952	11,697,952
Options
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	11,121,357	10,719,869	11,024,633	10,633,802
Restricted stock
Total anti-dilutive shares
Anti-dilutive shares excluded from the calculation (in shares)	4,073,280	3,626,814	3,921,208	3,453,767

ACCRUED EXPENSES (Tables)

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

Summary of Accrued Expenses

Accrued expenses at June 30, 2024 and December 31, 2023 consisted of the following (in thousands):


	June 30, 2024		December 31, 2023

Compensation related costs	$	22,502	$	29,908
Research and development	18,081		26,006
Sales discounts, rebates, and allowances	10,565		13,730
Accrued royalties	8,718		6,991
Selling, general and administrative	6,872		7,190
Accrued restructuring costs	1,054		11,421
Transition services accrual	346		12,282
Miscellaneous accrued expenses	11,503		11,463
Total accrued expenses	$	79,641	$	118,991

SHARE-BASED COMPENSATION - Summary of Service Based Restricted Stock Activity (Details) - Restricted stock units $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
Number of Restricted Stock Units
Beginning balance (in shares) \| shares	2,874,046
Granted (in shares) \| shares	1,962,025
Vested (in shares) \| shares	(849,945)
Forfeited/canceled (in shares) \| shares	(246,050)
Ending balance (in shares) \| shares	3,740,076
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 22.97
Granted (in dollars per share) \| $ / shares	8.84
Vested (in dollars per share) \| $ / shares	23.06
Forfeited/canceled (in dollars per share) \| $ / shares	20.18
Ending balance (in dollars per share) \| $ / shares	$ 15.72
Unamortized stock compensation expense \| $	$ 48.0
Weighted-average recognition period (in years)	2 years 9 months 18 days

EQUITY OFFERINGS (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended		12 Months Ended
	Feb. 28, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Feb. 29, 2020
Class of Stock [Line Items]
Proceeds from the issuance of pre-funded warrants, net of issuance costs		$ 0	$ 24,630
Underwritten Equity Offering
Class of Stock [Line Items]
Shares authorized in sale (in shares)	9,700,000
Sales price per share (in dollars per share)	$ 21.00
Proceeds from the issuance of common stock, net of issuance costs	$ 215,800
Underwritten Equity Offering \| Common Stock
Class of Stock [Line Items]
Prefunded warrants, notice period for modifying limitations	61 days
Pre-funded warrants exercisable for share of common stock (in shares)	1
Underwritten Equity Offering \| Pre Funded Warrant
Class of Stock [Line Items]
Number of securities called by warrants or rights (in shares)	1,250,000
Sales price per share (in dollars per share)	$ 20.9999
Exercise price of each pre-funded warrant (in dollars per share)	$ 0.0001
Proceeds from the issuance of pre-funded warrants, net of issuance costs	$ 24,600
At-The-Market Offering
Class of Stock [Line Items]
Shares authorized in sale (in shares)		0		0
Proceeds from the issuance of common stock, net of issuance costs					$ 20,100
Aggregate offering amount authorized						$ 100,000
Remaining offering amount authorized		$ 19,500
At-The-Market Offering Under Previous Registration Statement
Class of Stock [Line Items]
Amount sold to date		28,600
At-The-Market Offering Under Current Registration Statement
Class of Stock [Line Items]
Amount sold to date		$ 51,900

LEASES - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
LEASES - Additional Information (Details) $ in Thousands	Jun. 30, 2024 USD ($) lease	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) lease	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease right of use assets	$ 16,467		$ 16,467		$ 18,061
Lease liability	$ 25,101		$ 25,101
Operating lease extension term	5 years		5 years
Operating lease expense	$ 1,200	$ 1,200	$ 2,400	$ 2,500
Office Lease 2020
Lessee, Lease, Description [Line Items]
Operating lease right of use assets						$ 34,600
Lease liability						34,500
Lease incentive, tenant improvements						$ 7,900
Kilroy Realty, L.P.
Lessee, Lease, Description [Line Items]
Number of operating leases \| lease	2		2
Esprit Investments Limited
Lessee, Lease, Description [Line Items]
Number of operating leases \| lease	1		1
Operating lease right of use assets	$ 400		$ 400
Lease liability	$ 400		$ 400
Operating lease extension term	5 years		5 years

INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Finite-lived Amortizable Intangible Assets

The following table sets forth amortizable intangible assets as of June 30, 2024 and December 31, 2023 (in thousands):


	June 30, 2024		December 31, 2023
Finite-lived intangible assets	$	203,017	$	183,037
Less: accumulated amortization	(98,596)		(79,347)
Net carrying value	$	104,421	$	103,690

Summary of Amortization Expense

The following table summarizes amortization expense for the three and six months ended June 30, 2024 and 2023 (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Research and development	$	—	$	2,420	$	—	$	4,814
Selling, general and administrative	9,897		7,967		19,249		11,635
Total amortization expense	$	9,897	$	10,387	$	19,249	$	16,449

REVENUE RECOGNITION - Additional Information (Details)	6 Months Ended
REVENUE RECOGNITION - Additional Information (Details)	Jun. 30, 2024 pharmacy
Disaggregation of Revenue [Line Items]
Number of direct-to-patient pharmacies sold to	3
Revenue, performance obligation, description of timing	For FILSPARI, sales are recognized upon delivery of the product to the specialty pharmacies. The Company receives payments from its FILSPARI sales based on terms that are generally 30 days from shipment of the product to the specialty pharmacy. For the Company's other products, product sales are recognized upon delivery to the patient. The Company receives payments from sales of its other products, primarily through third party payers, based on terms that generally are within 30 days of delivery of product to the patient.
Geographic Concentration Risk \| Revenue Benchmark \| United States
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	98.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details