Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues
Total revenues	$ 2,911	$ 3,815	$ 8,424	$ 7,250
Operating Expenses
Impairment of goodwill			482	0
Impairment of other noncurrent assets			638	543
Other Expense, Net
Equity in net loss of affiliates			(1)	(3)
Loss from continuing operations before income taxes	(26,148)	(30,999)	(50,104)	(57,902)
Income from discontinued operations, net of income taxes	8,424	10,889	13,071	20,422
Net loss	$ (17,635)	$ (20,050)	$ (36,886)	$ (37,368)
Net Loss per Share
Net loss from continuing operations per share, basic (in dollars per share)	$ (0.13)	$ (0.16)	$ (0.25)	$ (0.29)
Net loss from continuing operating per share, diluted (in dollars per share)	(0.13)	(0.16)	(0.25)	(0.29)
Net income (loss) from discontinued operations per share, diluted (in dollars per share)	0.04	0.06	0.07	0.10
Net income (loss) from discontinued operations per share, basic (in dollars per share)	0.04	0.06	0.07	0.10
Net loss per share, basic (in dollars per share)	(0.09)	(0.10)	(0.18)	(0.19)
Net loss per share, diluted (in dollars per share)	$ (0.09)	$ (0.10)	$ (0.18)	$ (0.19)
Weighted average shares outstanding, basic (in shares)	200,461,441	199,021,587	200,047,629	196,275,820
Weighted average shares outstanding, diluted (in shares)	200,461,441	199,021,587	200,047,629	196,275,820
Collaboration and licensing agreements
Revenues
Total revenues	$ 0	$ 301	$ 0	$ 367
Continuing Operations
Revenues
Total revenues	2,911	3,815	8,424	7,250
Operating Expenses
Research and development	11,954	13,184	23,755	23,321
Selling, general and administrative	12,670	14,954	26,359	29,220
Impairment of goodwill	0	0	482	0
Impairment of other noncurrent assets	638	543	638	543
Total operating expenses	27,073	30,031	54,739	55,796
Operating loss	(24,162)	(26,216)	(46,315)	(48,546)
Other Expense, Net
Interest expense	(2,063)	(4,633)	(4,101)	(9,137)
Interest income	37	49	75	81
Other income (expense), net	40	(199)	238	(297)
Total other expense, net	(1,986)	(4,783)	(3,788)	(9,353)
Equity in net loss of affiliates	0	0	(1)	(3)
Loss from continuing operations before income taxes	(26,148)	(30,999)	(50,104)	(57,902)
Income tax benefit	89	60	147	112
Loss from continuing operations	(26,059)	(30,939)	(49,957)	(57,790)
Continuing Operations | Collaboration and licensing agreements
Revenues
Total revenues	0	301	0	367
Continuing Operations | Product revenues
Revenues
Total revenues	621	694	1,113	1,306
Operating Expenses
Cost of products and services	645	436	1,122	824
Continuing Operations | Service revenues
Revenues
Total revenues	2,213	2,679	7,146	5,303
Operating Expenses
Cost of products and services	1,166	914	2,383	1,888
Continuing Operations | Other
Revenues
Total revenues	$ 77	$ 141	$ 165	$ 274