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	$ 10,654	$ 4,284	$ 18,456	$ 6,320
Operating expenses:
Research and development	48,968	41,231	96,243	77,037
General and administrative	18,187	14,803	36,515	27,585
Total operating expenses	67,155	56,034	132,758	104,622
Other income (expense):
Interest income	3,219	291	5,840	309
Interest expense	(1,025)	(760)	(2,008)	(1,484)
Total other income (expense), net	2,194	(469)	3,832	(1,175)
Net loss	(54,307)	(52,219)	(110,470)	(99,477)
Unrealized (loss) gain on marketable securities	(61)	(126)	103	(126)
Comprehensive loss	(54,368)	(52,345)	(110,367)	(99,603)
Net loss attributable to common stockholders — basic	(54,307)	(52,219)	(110,470)	(99,477)
Net loss attributable to common stockholders — diluted	$ (54,307)	$ (52,219)	$ (110,470)	$ (99,477)
Net loss per share attributable to common stockholders — basic (in dollars per share)	$ (0.47)	$ (0.55)	$ (0.99)	$ (1.13)
Net loss per share attributable to common stockholders — diluted (in dollars per share)	$ (0.47)	$ (0.55)	$ (0.99)	$ (1.13)
Weighted-average number of shares of common stock used in net loss per share attributable to common stockholders — basic (in shares)	115,608,156	95,756,782	111,583,765	87,886,411
Weighted-average number of shares of common stock used in net loss per share attributable to common stockholders — diluted (in shares)	115,608,156	95,756,782	111,583,765	87,886,411