Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating expenses:
Research and development	$ 1,322	$ 14,072	$ 10,311	$ 36,297
General and administrative	3,842	4,007	12,736	11,695
Restructuring charges	0		902
Gain from lease termination and asset sale			(508)
Total operating expenses	5,164	18,079	23,441	47,992
Loss from operations	(5,164)	(18,079)	(23,441)	(47,992)
Other income (expense):
Interest income	228	22	318	85
Interest expense	(550)	(252)	(1,475)	(743)
Other expense, net	(35)	(19)	(65)	(31)
Total other income (expense)	(357)	(249)	(1,222)	(689)
Net loss	(5,521)	(18,328)	(24,663)	(48,681)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities, net	20	(5)	5	1
Comprehensive loss	$ (5,501)	$ (18,333)	$ (24,658)	$ (48,680)
Net loss per share, basic	$ (0.13)	$ (0.69)	$ (0.58)	$ (1.85)
Weighted average shares of common stock outstanding, basic	42,569,515	26,521,689	42,376,858	26,300,676
Net loss per share, diluted	$ (0.13)	$ (0.69)	$ (0.58)	$ (1.85)
Weighted average shares of common stock outstanding, diluted	42,569,515	26,521,689	42,376,858	26,300,676