Intangible Assets, Net and Other non-current Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended		63 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Payment	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 2,867		$ 2,867		$ 2,867	$ 2,867
Less: accumulated amortization	(2,791)		(2,791)		(2,791)	(2,765)
Intangible assets, net	76		76		76	102
Royalty receivable	6,000		6,000		6,000	7,000
Other	908		908		908	836
Total other non-current assets	6,908		6,908		6,908	7,836
Amortization expense	12	$ 12	25	$ 25
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	50		50		50
2022	50		50		50
Revenues	15,345	21,675	26,467	30,440
Royalty
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Revenues			(1,034)
Sunovion
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Revenues					22,000
Minimum annual royalty receivable	1,000	$ 1,000	$ 1,000	$ 1,000	1,000
Guaranteed royalty period		8 years	8 years
Number of annual royalty payments receivable | Payment			7
Sunovion | Royalty
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Revenues		$ 8,000
Purchased technology-based intangible
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	2,358		$ 2,358		2,358	2,358
Purchased patent
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 509		$ 509		$ 509	$ 509