Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Allowance for expected sales discounts and allowances	$ 11.1	$ 11.0

Represents the allowance for sales discounts related to prompt-pay discounts and contractual fee for service arrangements to wholesalers and distributors.

No definition available.

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