Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Nonrecourse liability related to sale of future royalties, long term	$ 18,369	$ 19,248	$ 30,000

Noncurrent portion of debt, net of the amount due within one year or the normal operating cycle, if longer, related to the sale of future royalties, for which the creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

No definition available.

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