Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Condensed Consolidated Statements of Operations
License and collaboration revenue - related party		$ 10,286	$ 26,581	$ 18,740
Revenue from Contract with Customer, Product and Service [Extensible List]	License and Collaboration Agreement	License and Collaboration Agreement	License and Collaboration Agreement	License and Collaboration Agreement
Operating expenses:
Research and development	$ 25,402	$ 36,956	$ 96,331	$ 87,633
General and administrative	6,901	7,256	25,107	19,936
Total operating expenses	32,303	44,212	121,438	107,569
Loss from operations	(32,303)	(33,926)	(94,857)	(88,829)
Interest income	1,157	122	1,809	321
Other expense, net	(86)		(151)	(136)
Net loss	$ (31,232)	$ (33,804)	$ (93,199)	$ (88,644)
Net loss per share, basic	$ (0.64)	$ (0.70)	$ (1.90)	$ (1.94)
Net loss per share, diluted	$ (0.64)	$ (0.70)	$ (1.90)	$ (1.94)
Weighted-average shares used to compute net loss per share, basic	49,107,639	47,987,184	48,971,329	45,705,782
Weighted-average shares used to compute net loss per share, diluted	49,107,639	47,987,184	48,971,329	45,705,782