Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 4,645	$ 5,589
General and administrative	2,380	2,500
Total operating expenses	7,025	8,089
Loss from operations	(7,025)	(8,089)
Other (expense) income:
Change in fair value of term loan derivative liability	(11)	(6)
Interest income	4	3
Interest expense	(302)	(294)
Total other expense, net	(309)	(297)
Loss before income taxes	(7,334)	(8,386)
Income tax benefit	5	15
Net loss	$ (7,329)	$ (8,371)
Basic and diluted net loss per common share outstanding	$ (0.24)	$ (0.43)
Weighted average common shares used in net loss per share attributable to common stockholders, basic and diluted	30,805,804	19,417,038