Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Collaboration and other revenue		$ 250		$ 250
Operating expenses:
Research and development expense	20,711	14,850	37,634	25,273
General and administrative expense	8,344	15,860	15,767	24,234
Total operating expenses	29,055	30,710	53,401	49,507
Loss from operations	(29,055)	(30,460)	(53,401)	(49,257)
Other income (expense):
Interest income	146	80	231	178
Interest expense		(1)		(3)
Other income	3		10
Total other income (expense)	149	79	241	175
Consolidated net loss and comprehensive loss	$ (28,906)	$ (30,381)	$ (53,160)	$ (49,082)
Net loss per common share, basic	$ (0.77)	$ (0.90)	$ (1.42)	$ (1.46)
Net loss per common share, diluted	$ (0.77)	$ (0.90)	$ (1.42)	$ (1.46)
Weighted-average shares of common stock outstanding, basic	37,420,327	33,678,893	37,371,614	33,671,298
Weighted-average shares of common stock outstanding, diluted	37,420,327	33,678,893	37,371,614	33,671,298