Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Services revenue	$ 866	$ 2,044
Grant revenue	1,071	1,495
Total revenue	1,937	3,539
Cost of revenue:
Cost of services revenue (including depreciation)	941	2,592
Cost of grant revenue	1,071	1,495
Provision for contract losses	370	33,737
Total cost of revenue	2,382	37,824
Gross loss	(445)	(34,285)
Operating expenses:
Selling, general and administrative	4,165	20,062
Research and development	5,260	9,375
Impairment charges	1,008	0
Total operating expenses	10,433	29,437
Operating loss	(10,878)	(63,722)
Interest income, net	283	194
Gain on warrant remeasurement	304	4,026
Other expense, net	(253)	(76)
Net loss before taxes	(10,544)	(59,578)
Benefit for income taxes	0	610
Net loss	$ (10,544)	$ (58,968)
Loss per share:
Loss per share – Basic (in dollars per share)	$ (0.05)	$ (0.32)
Loss per share – Diluted (in dollars per share)	$ (0.05)	$ (0.32)
Weighted average number of shares outstanding – Basic (in shares)	196,899,292	184,031,015
Weighted average number of shares outstanding – Diluted (in shares)	196,899,292	184,031,015