Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Collaboration revenue	$ 14		$ 14
Operating expenses:
Research and development	7,077	$ 3,712	19,352	$ 8,779
General and administrative	4,018	2,651	10,639	6,377
Total operating expenses	11,095	6,363	29,991	15,156
Loss from operations	(11,081)	(6,363)	(29,977)	(15,156)
Other income:
Interest income	26	29	81	50
Total other income	26	29	81	50
Net loss	(11,055)	(6,334)	(29,896)	(15,106)
Comprehensive loss	$ (11,055)	$ (6,334)	$ (29,896)	$ (15,106)
Net loss per share attributable to common stockholders—basic and diluted	$ (0.85)	$ (0.49)	$ (2.30)	$ (2.13)
Weighted-average common shares outstanding—basic and diluted	13,001,514	12,924,682	12,979,837	7,133,967