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ADDITIONAL BALANCE SHEET DETAIL - Summary of Accrued Expenses and other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Payables and Accruals [Abstract]
Product revenue allowances	$ 27,451	$ 15,727
Product return reserves, current portion	5,186	5,295
Clinical trial costs	773	1,885
Compensation and related benefits	5,673	9,194
Operating lease liabilities, current portion	$ 5,514	$ 5,400
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total accrued expenses and other current liabilities	Total accrued expenses and other current liabilities
Royalties due to Panion & BF Biotech, Inc.	$ 3,267	$ 3,543
Professional fees	1,035	1,452
Accrued manufacturing costs	1,580	1,468
Restructuring costs	251	489
BioVectra, Inc. termination fees	4,894	7,204
Liability related to sale of future royalties, current portion	2,048	2,039
Settlement royalties liability, current portion	10,577	5,924
Other	3,088	3,840
Total accrued expenses and other current liabilities	$ 71,337	$ 63,460

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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.

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