Commitments and Contingencies - New Headquarters Lease (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Afecta Pharmaceuticals Inc \| Maximum
Potential maximum milestone payments payable	$ 300
Rune HealthCare Limited
Milestone payments due	$ 0

The potential maximum amount payable upon achievement of certain milestones, under the purchase and sale agreement.

No definition available.

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