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ADDITIONAL BALANCE SHEET DETAIL - Schedule of Accrued Expenses and other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Payables and Accruals [Abstract] |  |
Product revenue allowances | $ 7,916 | $ 9,657
Product rebates | 64,674 | 6,070
Product return provisions, current portion | 2,375 | 5,295
Compensation and related benefits | 11,018 | 9,194
Operating lease liabilities, current portion | 3,548 | 5,400
Royalties due to Panion & BF Biotech, Inc. | 3,924 | 3,543
Liability related to sale of future royalties, current portion | 1,664 | 2,039
Professional fees | 1,597 | 1,452
Accrued manufacturing costs | 1,808 | 1,468
BioVectra, Inc. termination fees, current portion | 0 | 7,204
Settlement royalties liability, current portion | 12,516 | 5,924
Clinical trial costs | 1,188 | 1,885
Restructuring costs, current portion | 0 | 489
Payments due to Q32 | 5,000 | 0
Other | 4,488 | 3,840
Total accrued expenses and other current liabilities | $ 121,716 | $ 63,460
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Total accrued expenses and other current liabilities | Total accrued expenses and other current liabilities

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- Definition Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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