CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Collaboration Revenue—from related parties	$ 16,513	$ 11,514	$ 25,979	$ 21,136
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Operating expenses:
Research and development	$ 45,767	$ 41,293	$ 87,994	$ 77,238
General and administrative	14,129	11,031	26,694	21,642
Total operating expenses	59,896	52,324	114,688	98,880
Loss from operations	(43,383)	(40,810)	(88,709)	(77,744)
Other income (expense):
Interest and other Income	4,632	594	9,085	884
Interest and other expense	(48)	(41)	(103)	(81)
Total other income:	4,584	553	8,982	803
Net loss	(38,799)	(40,257)	(79,727)	(76,941)
Other comprehensive loss:
Unrealized (loss) gain on marketable securities	(597)	(767)	1,314	(3,323)
Total comprehensive loss	(39,396)	(41,024)	(78,413)	(80,264)
Net loss	$ (38,799)	$ (40,257)	$ (79,727)	$ (76,941)
Net loss per share, basic and diluted	$ (0.67)	$ (0.78)	$ (1.37)	$ (1.49)
Net loss per share, basic and diluted	$ (0.67)	$ (0.78)	$ (1.37)	$ (1.49)
Weighted average common shares outstanding, basic and diluted	58,326,963	51,772,440	58,257,387	51,712,081
Weighted average common shares outstanding, basic and diluted	58,326,963	51,772,440	58,257,387	51,712,081