Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating expenses
Research and development	$ 23,578	$ 39,052
General and administrative	7,010	15,531
Total operating expenses	30,588	54,583
Other operating income (expense)
Impairment of property and equipment	0	(1,265)
(Loss) Gain on dispositions, net	(478)	3,656
Total other operating income (expense)	(478)	2,391
Loss from operations	(24,866)	(51,692)
Other income (expense):
Interest income	32	387
Interest expense	(4)	(2,659)
Change in fair value of warrant and private placement option liabilities	15,126	46,130
Gain on extinguishment of debt	0	112
Other income	7	0
Total other income	15,161	43,970
Net loss	$ (9,705)	$ (7,722)
Net loss per common share attributable to common shareholders, basic (in dollars per share)	$ (0.84)	$ (1.34)
Net loss per common share attributable to common shareholders, diluted (in dollars per share)	$ (0.84)	$ (1.34)
Weighted-average shares outstanding-basic (in shares)	11,504,294	5,760,159
Weighted-average shares outstanding- diluted (in shares)	11,504,294	5,760,159
Net loss	$ (9,705)	$ (7,722)
Other comprehensive income (loss):
Foreign currency translation adjustment	1	(12)
Comprehensive loss	(9,704)	(7,734)
Supply Agreement And License Revenue
Revenues
Revenues	6,200	500
Supply agreement
Revenues
Revenues	700	0
License revenue
Revenues
Revenues	$ 5,500	$ 500