Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Collaboration Revenue—from related party	$ 72,832	$ 34,034	$ 2,934
Revenue from Contract with Customer, Product and Service [Extensible List]	Collaboration Revenues From Related Party [Member]	Collaboration Revenues From Related Party [Member]	Collaboration Revenues From Related Party [Member]
Operating expenses:
Research and development	$ 137,017	$ 62,105	$ 37,158
General and administrative	36,345	18,233	7,981
Total operating expenses	173,362	80,338	45,139
Loss from operations	(100,530)	(46,304)	(42,205)
Other income (expense):
Interest and other income	488	826	1,005
Interest and other expense	(175)	(115)	(46)
Total other income	313	711	959
Net loss	(100,217)	(45,593)	(41,246)
Other comprehensive loss:
Unrealized (loss) gain on marketable securities	(532)	(134)	6
Total comprehensive loss	(100,749)	(45,727)	(41,240)
Reconciliation of net loss to net loss attributable to common stockholders:
Net Loss	(100,217)	(45,593)	(41,246)
Deemed dividend from exchange of convertible preferred stock		(9,050)
Net loss attributable to common stockholders	$ (100,217)	$ (54,643)	$ (41,246)
Net loss per share attributable to common stockholders, basic and diluted	$ (2.09)	$ (3.15)	$ (24.28)
Weighted average common stocks outstanding, basic and diluted	47,989,023	17,349,582	1,698,522