Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 0	$ 0	$ 0	$ 0
Operating expenses:
Research and development	3,888	4,204	9,576	8,824
General and administrative	2,492	3,196	5,129	5,617
Depreciation and amortization	31	34	61	66
Total operating expenses	6,411	7,434	14,766	14,507
Loss from operations	(6,411)	(7,434)	(14,766)	(14,507)
Other income:
Gain from change in fair value of warrant liability	36	603	75	763
Other income, net	9	15	17	20
Interest income, net	390	39	783	80
Net loss	$ (5,976)	$ (6,777)	$ (13,891)	$ (13,644)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.20)	$ (0.24)	$ (0.48)	$ (0.48)
Weighted average common shares outstanding, basic and diluted (in shares)	29,688,862	28,583,014	29,222,012	28,580,689
Net loss	$ (5,976)	$ (6,777)	$ (13,891)	$ (13,644)
Other comprehensive loss:
Foreign currency translation	(1)	(31)	(5)	(19)
Comprehensive loss	$ (5,977)	$ (6,808)	$ (13,896)	$ (13,663)