Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - 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 revenue	$ 1,882	$ 4,381	$ 4,474	$ 9,170
Operating expenses:
Research and development	25,019	17,378	42,850	33,712
General and administrative	11,098	6,685	21,857	12,183
Total operating expenses	36,117	24,063	64,707	45,895
Loss from operations	(34,235)	(19,682)	(60,233)	(36,725)
Other income, net	165	34	235	78
Net loss	$ (34,070)	$ (19,648)	$ (59,998)	$ (36,647)
Net loss per share, basic	$ (0.83)	$ (0.60)	$ (1.47)	$ (1.14)
Net loss per share, diluted	$ (0.83)	$ (0.60)	$ (1.47)	$ (1.14)
Weighted-average common shares outstanding, basic	40,890	32,636	40,768	32,076
Weighted-average common shares outstanding, diluted	40,890	32,636	40,768	32,076
Comprehensive loss:
Net loss	$ (34,070)	$ (19,648)	$ (59,998)	$ (36,647)
Other comprehensive (loss) gain:
Unrealized gain (loss) on marketable securities	22	(5)	(671)	(7)
Total other comprehensive loss	22	(5)	(671)	(7)
Comprehensive loss	$ (34,048)	$ (19,653)	$ (60,669)	$ (36,654)