Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Collaboration Revenue—from related party	$ 78,592	$ 46,826	$ 72,832
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	$ 189,081	$ 164,248	$ 137,017
General and administrative	55,041	43,834	36,345
Total operating expenses	244,122	208,082	173,362
Loss from operations	(165,530)	(161,256)	(100,530)
Other income (expense):
Interest and other income	18,764	6,624	488
Interest and other expense	(196)	(176)	(175)
Total other income	18,568	6,448	313
Net loss	(146,962)	(154,808)	(100,217)
Other comprehensive loss:
Unrealized (loss) gain on marketable securities	4,397	(4,289)	(532)
Total comprehensive loss	(142,565)	(159,097)	(100,749)
Reconciliation of net loss to net loss attributable to common stockholders:
Net Income (Loss)	(146,962)	(154,808)	(100,217)
Net loss attributable to common stockholders	$ (146,962)	$ (154,808)	$ (100,217)
Net loss per share, basic	$ (2.52)	$ (2.87)	$ (2.09)
Net loss per share, diluted	$ (2.52)	$ (2.87)	$ (2.09)
Weighted average common shares outstanding, diluted	58,365,499	53,933,229	47,989,023
Weighted average common shares outstanding, basic	58,365,499	53,933,229	47,989,023