Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 0	$ 0	$ 0	$ 0
Operating expenses:
Research and development	4,204	3,039	8,824	7,145
General and administrative	3,196	2,434	5,617	4,373
Depreciation and amortization	34	44	66	88
Total operating expenses	7,434	5,517	14,507	11,606
Loss from operations	(7,434)	(5,517)	(14,507)	(11,606)
Other income:
Gain from change in fair value of warrant liability	603	1,173	763	2,750
Other income, net	15	8	20	18
Interest income, net	39	92	80	149
Net loss	$ (6,777)	$ (4,244)	$ (13,644)	$ (8,689)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.24)	$ (0.15)	$ (0.48)	$ (0.35)
Weighted average common shares outstanding, basic and diluted (in shares)	28,583,014	28,451,532	28,580,689	25,148,399
Net loss	$ (6,777)	$ (4,244)	$ (13,644)	$ (8,689)
Other comprehensive loss:
Foreign currency translation	(31)	(6)	(19)	(10)
Comprehensive loss	$ (6,808)	$ (4,250)	$ (13,663)	$ (8,699)