CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Collaboration Revenues	$ 3,741	$ 4,728	$ 39,678	$ 30,707
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	$ 60,410	$ 48,117	$ 168,431	$ 136,111
General and administrative	15,455	14,120	47,202	40,814
Impairment of long-lived assets	0	0	4,925	0
Total operating expenses	75,865	62,237	220,558	176,925
Loss from operations	(72,124)	(57,509)	(180,880)	(146,218)
Other income (expense):
Interest and other Income	9,697	4,683	27,964	13,768
Interest and other expense	(60)	(41)	(190)	(144)
Total other income:	9,637	4,642	27,774	13,624
Net loss	(62,487)	(52,867)	(153,106)	(132,594)
Other comprehensive loss:
Unrealized gain on marketable securities	4,030	1,185	2,483	2,499
Total comprehensive loss	(58,457)	(51,682)	(150,623)	(130,095)
Net loss	$ (62,487)	$ (52,867)	$ (153,106)	$ (132,594)
Net loss per share, basic	$ (0.82)	$ (0.9)	$ (2.09)	$ (2.27)
Net loss per share, diluted	$ (0.82)	$ (0.9)	$ (2.09)	$ (2.27)
Weighted average common shares outstanding, basic	76,125,975	58,421,859	73,330,338	58,312,813
Weighted average common shares outstanding, diluted	76,125,975	58,421,859	73,330,338	58,312,813