Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 111	$ 0
Total revenues	111	0
Operating expenses:
Research and development	4,221	4,660
General and administrative	3,621	3,957
Total operating expenses	7,842	8,617
Loss from operations	(7,731)	(8,617)
Other income and expense:
Other income, net	6	20
Interest income	5	3
Interest expense	0	(37)
Other (expense) income, net	11	(14)
Net loss	$ (7,720)	$ (8,631)
Net loss per share:
Basic (in dollars per share)	$ (0.92)	$ (1.04)
Diluted (in dollars per share)	$ (0.92)	$ (1.04)
Weighted average number of common shares outstanding:
Basic (in shares)	8,357,969	8,316,888
Diluted (in shares)	8,357,969	8,316,888