Composition of Other Balance Sheet Items - Schedule of Accrued Product Returns and Rebates (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued product rebates	$ 141,190	$ 115,330
Accrued product returns	43,269	53,375
Total	$ 184,459	$ 168,705

Carrying value as of the balance sheet date of accrued product returns and rebates.

No definition available.

Name:	supn_AccruedProductReturnsAndRebates
Namespace Prefix:	supn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant