Finance Lease, Fixed Lease, Cost

No definition available.

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

- Definition

Lessee, Finance Lease, Incremental Borrowing Rate

+ References

No definition available.

+ Details

Name:	supn_LesseeFinanceLeaseIncrementalBorrowingRate
Namespace Prefix:	supn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

- Details

Name:	srt_CounterpartyNameAxis=supn_MDDUSEnterprisesLLCFormerlyUSWMEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2020	Jun. 09, 2020	Dec. 31, 2019
Leases
Finance lease asset	$ 21,676	$ 21,676		$ 0
MDD US Enterprises LLC (Formerly USWM Enterprises)
Leases
Finance lease asset			$ 22,700
Finance lease liability			$ 22,700
Finance lease incremental borrowing rate			2.50%
Fixed lease cost	$ 800	$ 1,100