CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - 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]
Related party revenue	$ 1,423	$ 8,293	$ 3,670	$ 29,241
Operating expenses:
Research and development	32,351	45,433	73,208	88,239
General and administrative	9,647	9,927	21,231	20,650
Total operating expenses	41,998	55,360	94,439	108,889
Loss from operations	(40,575)	(47,067)	(90,769)	(79,648)
Interest income, net	2,448	543	5,032	719
Other (expense) income, net	(134)	5	(171)	(40)
Net loss	$ (38,261)	$ (46,519)	$ (85,908)	$ (78,969)
Net loss per share, basic (in dollars per share)	$ (0.46)	$ (0.59)	$ (1.04)	$ (1.00)
Net loss per share, diluted (in dollars per share)	$ (0.46)	$ (0.59)	$ (1.04)	$ (1.00)
Weighted average shares used to compute net loss per share, basic (in shares)	82,456	79,270	82,233	78,650
Weighted average shares used to compute net loss per share, diluted (in shares)	82,456	79,270	82,233	78,650