Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 401	$ 224	$ 802	$ 448

Amortization of intangible assets including cost of sales.

No definition available.

Name:	slgd_AmortizationOfIntangibleAssetsIncludingCostOfSales
Namespace Prefix:	slgd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration