Accrued Product Returns and Rebates (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued Product Returns and Rebates
Accrued product rebates	$ 110,543	$ 88,811
Accrued product returns	26,430	18,818
Total	$ 136,973	$ 107,629

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