Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 6,680	$ 10,857
General and administrative	5,482	3,696
Restructuring charges	858
Gain from lease termination and asset sale	(508)
Total operating expenses	12,512	14,553
Loss from operations	(12,512)	(14,553)
Other income (expense):
Interest income	23	36
Interest expense	(414)	(244)
Other income (expense)	23	(7)
Total other income (expense)	(368)	(215)
Net loss	(12,880)	(14,768)
Other comprehensive loss:
Unrealized loss on available-for-sale securities, net	(38)	(2)
Comprehensive loss	$ (12,918)	$ (14,770)
Net loss per share, basic and diluted	$ (0.31)	$ (0.57)
Weighted average shares of common stock outstanding, basic and diluted	42,125,693	26,007,692