Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues	$ 0	$ 0
Operating expenses:
Research and development	4,620	4,105
General and administrative	2,422	1,939
Depreciation and amortization	32	44
Total operating expenses	7,074	6,088
Loss from operations	(7,074)	(6,088)
Other income:
Gain from change in fair value of warrant liability	160	1,577
Other income, net	5	9
Interest income, net	42	57
Net loss	$ (6,867)	$ (4,445)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.24)	$ (0.20)
Weighted average common shares outstanding, basic and diluted (in shares)	28,578,338	21,808,565
Net loss	$ (6,867)	$ (4,445)
Other comprehensive income (loss):
Foreign currency translation	12	(4)
Comprehensive loss	$ (6,855)	$ (4,449)