Discontinued Operations - Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating costs and expenses:
Loss from discontinued operations, net of income taxes	$ (40)	$ (21)
Sale | Commercial Product Portfolio
Operating costs and expenses:
Selling, general and administrative	0	0
Research and development	38	21
Total operating costs and expenses	40	21
Loss from discontinued operations before income taxes	(40)	(21)
Provision for income taxes from discontinued operations	0	0
Loss from discontinued operations, net of income taxes	(40)	(21)
Sale | Commercial Product Portfolio | Product sales, net
Operating costs and expenses:
Cost of sales (excluding amortization of intangible assets)	$ 2	$ 0