Condensed Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ 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	$ 2,316	$ 2,178	$ 4,549	$ 3,973
Operating expenses:
Research and development	42,672	39,789	90,437	67,477
General and administrative	12,278	8,688	24,342	17,255
Total operating expenses	54,950	48,477	114,779	84,732
Loss from operations	(52,634)	(46,299)	(110,230)	(80,759)
Other income (expense):
Interest income	5,771	611	11,287	861
Other expense	(162)	(2)	(476)	(27)
Total other income	5,609	609	10,811	834
Net loss	(47,025)	(45,690)	(99,419)	(79,925)
Other comprehensive loss:
Net unrealized (losses) gains on marketable securities	(1,137)	(960)	32	(2,799)
Comprehensive loss	$ (48,162)	$ (46,650)	$ (99,387)	$ (82,724)
Net loss per share, basic (in dollars per share)	$ (0.66)	$ (0.92)	$ (1.40)	$ (1.63)
Net loss per share, diluted (in dollars per share)	$ (0.66)	$ (0.92)	$ (1.40)	$ (1.63)
Weighted-average shares outstanding, basic (in shares)	71,390	49,927	70,914	49,091
Weighted-average shares outstanding, diluted (in shares)	71,390	49,927	70,914	49,091