Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Collaboration revenue	$ 5,599	$ 4,490	$ 10,908	$ 8,410
Operating expenses:
Research and development	29,248	25,974	59,233	50,482
General and administrative	8,401	7,704	17,042	14,920
Total operating expenses	37,649	33,678	76,275	65,402
Loss from operations	(32,050)	(29,188)	(65,367)	(56,992)
Other income (expense):
Interest income	2,793	1,225	5,462	1,460
Other income, net	712	650	1,432	1,305
Total other income, net	3,505	1,875	6,894	2,765
Loss before income taxes	(28,545)	(27,313)	(58,473)	(54,227)
Provision for income taxes	(942)	0	(1,502)	0
Net loss	$ (29,487)	$ (27,313)	$ (59,975)	$ (54,227)
Net loss per share attributable to common stockholders—basic (in dollars per share)	$ (0.70)		$ (1.43)	$ (1.31)
Net loss per share attributable to common stockholders—diluted (in dollars per share)	$ (0.70)	$ (0.66)	$ (1.43)	$ (1.31)
Weighted average common shares outstanding—basic (in shares)	41,825,555	41,515,305	41,818,361	41,442,746
Weighted average common shares outstanding—diluted (in shares)	41,825,555	41,515,305	41,818,361	41,442,746
Comprehensive loss:
Net loss	$ (29,487)	$ (27,313)	$ (59,975)	$ (54,227)
Other comprehensive loss:
Unrealized gains (losses) on marketable securities	151	(1,995)	1,267	(3,179)
Total other comprehensive gain (loss)	151	(1,995)	1,267	(3,179)
Total comprehensive loss	$ (29,336)	$ (29,308)	$ (58,708)	$ (57,406)