Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues
Total revenues	$ 1,000	$ 5,000	$ 1,000	$ 5,700
Operating expenses
Research and development	6,850	6,348	16,425	19,531
General and administrative	1,315	1,681	4,216	5,458
Total operating expenses	8,165	8,029	20,641	24,989
Other operating expense
Loss on dispositions, net	0	14	0	478
Loss from operations	(7,165)	(3,043)	(19,641)	(19,767)
Other income (expense):
Interest income	11	6	38	24
Interest expense	0	0	0	(4)
Change in fair value of warrant derivative and private placement option liabilities	(59)	4,264	827	7,506
Other income	0	6	0	5
Total other income (expense)	(48)	4,276	865	7,531
Net (loss) income	(7,213)	1,233	(18,776)	(12,236)
Less: undistributed earnings to participating securities	0	(469)	0	0
Net (loss) income attributable to common shareholders	$ (7,213)	$ 764	$ (18,776)	$ (12,236)
Net loss per common share attributable to common shareholders, basic (in dollars per share)	$ (0.23)	$ 0.08	$ (0.61)	$ (1.21)
Net loss per common share attributable to common shareholders, diluted (in dollars per share)	$ (0.23)	$ 0.07	$ (0.61)	$ (1.21)
Weighted-average shares outstanding, basic (in shares)	30,831,161	10,108,388	30,826,683	10,086,246
Weighted-average shares outstanding, diluted (in shares)	30,831,161	10,194,668	30,826,683	10,086,246
Net (loss) income	$ (7,213)	$ 1,233	$ (18,776)	$ (12,236)
Other comprehensive loss:
Foreign currency translation adjustment	(10)	(9)	(15)	(9)
Comprehensive (loss) income	(7,223)	1,224	(18,791)	(12,245)
Supply agreement
Revenues
Total revenues	0	0	0	700
License revenue
Revenues
Total revenues	$ 1,000	$ 5,000	$ 1,000	$ 5,000