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
Revenues
Collaboration revenue - related party	$ 44	$ 86	$ 96	$ 147
Operating expenses:
Research and development	62,038	57,171	142,276	117,327
General and administrative	18,524	19,509	37,408	39,406
Total operating expenses	80,562	76,680	179,684	156,733
Loss from operations	(80,518)	(76,594)	(179,588)	(156,586)
Other income (expense), net:
Interest and other income, net	3,778	315	5,837	807
Other (expenses) income	(1,249)	1,492	(2,942)	1,142
Total other income, net	2,529	1,807	2,895	1,949
Net loss	(77,989)	(74,787)	(176,693)	(154,637)
Other comprehensive loss:
Net unrealized gain (loss) on available-for-sale investments	2,083	(2,223)	6,075	(8,905)
Net comprehensive loss	$ (75,906)	$ (77,010)	$ (170,618)	$ (163,542)
Net loss per share, basic (in dollars per share)	$ (0.53)	$ (0.52)	$ (1.21)	$ (1.09)
Net loss per share, diluted (in dollars per share)	$ (0.53)	$ (0.52)	$ (1.21)	$ (1.09)
Weighted-average number of shares used in computing net loss per share, basic (in shares)	146,795,826	143,385,045	145,685,993	142,376,280
Weighted-average number of shares used in computing net loss per share, diluted (in shares)	146,795,826	143,385,045	145,685,993	142,376,280