Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Collaboration revenue	$ 26,581	$ 43	$ 828
Operating expenses:
Research and development	173,385	132,013	67,036
General and administrative	56,963	36,888	21,902
Total operating expenses	230,348	168,901	88,938
Other income (expense):
Interest income	2,883	65	424
Interest expense	(3,328)	(1,267)	(359)
Total other income (expense), net	(445)	(1,202)	65
Net loss	(204,212)	(170,060)	(88,045)
Other comprehensive loss:
Unrealized loss on marketable securities	(152)	0	(25)
Comprehensive loss	(204,364)	(170,060)	(88,070)
Net loss attributable to common stockholders - basic	(204,212)	(170,060)	(88,045)
Net loss attributable to common stockholders - diluted	$ (204,212)	$ (170,060)	$ (88,045)
Net loss per share attributable to common stockholders — basic (in dollars per share)	$ (2.18)	$ (2.41)	$ (1.43)
Net loss per share attributable to common stockholders — diluted (in dollars per share)	$ (2.18)	$ (2.41)	$ (1.43)
Weighted-average number of shares of common stock used in net loss per share attributable to common stockholders — basic (in shares)	93,654,243	70,580,949	61,485,205
Weighted-average number of shares of common stock used in net loss per share attributable to common stockholders — diluted (in shares)	93,654,243	70,580,949	61,485,205