Revenue (Future Performance Obligations) (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Revenue, Performance Obligation [Abstract]
Future performance obligations, remainder of 2018	$ 40,727
Future performance obligations, 2019	62,971
Future performance obligations, 2020	48,119
Future performance obligations, 2021	31,973
Future performance obligations, 2022 and thereafter	$ 51,975

Amount of transaction price allocated to performance obligation that has not been recognized as revenue in remainder of fiscal year.

No definition available.

Name:	sqbg_RevenueRemainingPerformanceObligationRemainderOfFiscalYear
Namespace Prefix:	sqbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of transaction price allocated to performance obligation that has not been recognized as revenue in year four and thereafter.

No definition available.

Name:	sqbg_RevenueRemainingPerformanceObligationYearFourAndThereafter
Namespace Prefix:	sqbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of transaction price allocated to performance obligation that has not been recognized as revenue in next fiscal year.

No definition available.

Name:	sqbg_RevenueRemainingPerformanceObligationYearOne
Namespace Prefix:	sqbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of transaction price allocated to performance obligation that has not been recognized as revenue in year three.

No definition available.

Name:	sqbg_RevenueRemainingPerformanceObligationYearThree
Namespace Prefix:	sqbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of transaction price allocated to performance obligation that has not been recognized as revenue in second fiscal year.

No definition available.

Name:	sqbg_RevenueRemainingPerformanceObligationYearTwo
Namespace Prefix:	sqbg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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