CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Related party revenue	$ 4,417	$ 55,333	$ 77,882
Operating expenses:
Research and development	118,040	181,067	161,712
General and administrative	37,840	40,515	36,865
Total operating expenses	155,880	221,582	198,577
Loss from operations	(151,463)	(166,249)	(120,695)
Interest income, net	9,322	3,714	420
Other expense, net	(234)	(132)	(60)
Net loss	$ (142,375)	$ (162,667)	$ (120,335)
Net loss per share, basic (in dollars per share)	$ (1.73)	$ (2.03)	$ (1.56)
Net loss per share, diluted (in dollars per share)	$ (1.73)	$ (2.03)	$ (1.56)
Weighted average shares used to compute net loss per share, basic (in shares)	82,496,000	79,950,000	77,085,000
Weighted average shares used to compute net loss per share, diluted (in shares)	82,496,000	79,950,000	77,085,000