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	$ 12,925	$ 8,142	$ 34,836	$ 20,288
General and administrative	5,677	3,643	15,876	7,415
Total operating expenses	18,602	11,785	50,712	27,703
Loss from operations	(18,602)	(11,785)	(50,712)	(27,703)
Other income:
Interest income	48		65	29
Total other income	48		65	29
Net loss and comprehensive loss	(18,554)	(11,785)	(50,647)	(27,674)
Cumulative dividends on redeemable convertible preferred stock		(2,185)	(1,228)	(3,755)
Net loss attributable to common stockholders	$ (18,554)	$ (13,970)	$ (51,875)	$ (31,429)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.50)	$ (61.23)	$ (1.62)	$ (177.84)
Weighted-average common shares outstanding, basic and diluted	36,934,311	228,144	32,067,535	176,726