Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating expenses:
Research and development	$ 14,072	$ 6,217	$ 36,297	$ 19,973
General and administrative	4,007	2,693	11,695	6,087
Total operating expenses	18,079	8,910	47,992	26,060
Loss from operations	(18,079)	(8,910)	(47,992)	(26,060)
Other income (expense):
Interest income	22	82	85	445
Interest expense	(252)	(258)	(743)	(765)
Other income (expense)	(19)	32	(31)	(108)
Total other income (expense)	(249)	(144)	(689)	(428)
Net loss	(18,328)	(9,054)	(48,681)	(26,488)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities, net	(5)	(65)	1	(27)
Comprehensive loss	$ (18,333)	$ (9,119)	$ (48,680)	$ (26,515)
Net loss per share, basic and diluted	$ (0.69)	$ (1.41)	$ (1.85)	$ (6.89)
Weighted average shares of common stock outstanding, basic and diluted	26,521,689	6,436,546	26,300,676	3,845,793