Collaboration Agreement (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2014
Collaboration agreement
Revenue From Royalty Agreement	$ 1,149	$ 1,119
Royalty Revenue	1,149	1,119
Noncash interest expense	$ 959	$ 1,279
Collaborative Arrangement \| United Therapeutics
Collaboration agreement
Revenue From Royalty Agreement			$ 30,000

Interest incurred in the period on the non-recourse sale of future royalty liability arrangement that was charged against earnings.

No definition available.

+ Details

Name:	supn_InterestExpenseNonRecourseRoyaltyLiability
Namespace Prefix:	supn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents revenue from the sale of certain royalty and milestone rights.

+ References

No definition available.

+ Details

Name:	supn_RevenueFromRoyaltyAgreement
Namespace Prefix:	supn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_RoyaltyRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	supn_CollaborativeArrangementsTransactionsAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=supn_UnitedTherapeuticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: