Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 7,758	$ 7,852
General and administrative	3,799	3,558
Total operating expenses	11,557	11,410
Loss from operations	(11,557)	(11,410)
Other income (expense):
Interest expense, net	(249)	(235)
Other income (expense), net	(7)	9
Other expense, net	(256)	(226)
Net loss	$ (11,813)	$ (11,636)
Net loss per share attributable to common stockholders—basic and diluted	$ (0.13)	$ (0.21)
Weighted-average common shares outstanding—basic and diluted	89,382,587	55,021,149
Comprehensive loss	$ (11,813)	$ (11,636)