CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Collaboration Revenue—from related parties	$ 9,622	$ 18,702
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	us-gaap:RevenueFromRelatedParties	us-gaap:RevenueFromRelatedParties
Operating expenses:
Research and development	$ 35,944	$ 25,962
General and administrative	10,611	5,909
Total operating expenses	46,555	31,871
Loss from operations	(36,933)	(13,169)
Other income (expense):
Interest and other Income	290	118
Interest and other expense	(41)	(24)
Total other income:	249	94
Net loss	(36,684)	(13,075)
Other comprehensive loss:
Unrealized loss on marketable securities	(2,556)	115
Total comprehensive loss	(39,240)	(12,960)
Reconciliation of net loss to net loss attributable to common stockholders:
Net loss attributable to common stockholders	$ (36,684)	$ (13,075)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.71)	$ (0.29)
Weighted average common stock outstanding, basic and diluted	51,651,125	44,649,572