CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Related party revenue	$ 20,948	$ 21,575
Operating expenses:
Research and development	42,806	40,699
General and administrative	10,723	8,721
Total operating expenses	53,529	49,420
Loss from operations	(32,581)	(27,845)
Interest income, net	176	114
Other (expense) income, net	(45)	187
Net loss	$ (32,450)	$ (27,544)
Net loss per share, basic (in dollars per share)	$ (0.42)	$ (0.36)
Net loss per share, diluted (in dollars per share)	$ (0.42)	$ (0.36)
Weighted average shares used to compute net loss per share, basic (in shares)	78,023	76,034
Weighted average shares used to compute net loss per share, diluted (in shares)	78,023	76,034