Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating expenses:
Research and development	$ 22,984	$ 22,328
General and administrative	9,492	10,161
Total operating expenses	32,476	32,489
Loss from operations	(32,476)	(32,489)
Other (expense) income:
Change in fair value of term loan derivative liability	82	(9)
Other expense	(375)
Interest income	10	178
Interest expense	(1,202)	(456)
Total other expense, net	(1,485)	(287)
Loss before income taxes	(33,961)	(32,776)
Income tax benefit	21	18
Net loss	$ (33,940)	$ (32,758)
Basic and diluted net loss per common share outstanding	$ (1.49)	$ (1.81)
Weighted average common shares used in net loss per share attributable to common stockholders, basic and diluted	22,841,481	18,059,011