Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Consolidated Statements of Operations
Revenue	$ 57	$ 57	$ 113	$ 113
Operating expenses:
General and administrative	2,139	2,850	4,325	5,067
Research and development	2,038	1,852	4,040	3,789
Total operating expenses	4,177	4,702	8,365	8,856
Loss from operations	(4,120)	(4,645)	(8,252)	(8,743)
Change in fair value of warrant liability		427		(209)
Other income, net	96	(13)	106	6
Net loss	$ (4,024)	$ (4,231)	$ (8,146)	$ (8,946)
Net loss per share, basic (in dollars per share)	$ (0.19)	$ (0.27)	$ (0.39)	$ (0.59)
Net loss per share, diluted (in dollars per share)	$ (0.19)	$ (0.27)	$ (0.39)	$ (0.59)
Basic weighted average shares outstanding (in shares)	20,904,085	15,780,863	20,904,085	15,201,719
Diluted weighted average shares outstanding (in shares)	20,904,085	15,780,863	20,904,085	15,201,719