Intangible Assets, Net and Other non-current assets (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Payment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Identifiable Intangible Assets [Abstract]
Intangible assets, gross		$ 2,867	$ 2,867
Less: accumulated amortization		(2,765)	(2,714)
Intangible assets, net		102	153
Royalty receivable		7,000	0
Other		836	286
Total other non-current assets		7,836	286
Amortization expense		51	50
Estimated Annual Amortization Expense [Abstract]
2021		51
2022		$ 51
Sunovion Pharmaceuticals, Inc. [Member]
Estimated Annual Amortization Expense [Abstract]
Minimum annual royalty receivable	$ 1,000
Guaranteed royalty period		8 years
Number of annual royalty payments receivable | Payment	7
Amount of first royalty receivable that reduces the existing annual minimum royalty	$ 1,000
Sunovion Pharmaceuticals, Inc. [Member] | Royalty [Member]
Estimated Annual Amortization Expense [Abstract]
Revenues	$ 8,000
Purchased Technology-Based Intangible [Member]
Identifiable Intangible Assets [Abstract]
Intangible assets, gross		$ 2,358	2,358
Purchased Patent [Member]
Identifiable Intangible Assets [Abstract]
Intangible assets, gross		$ 509	$ 509