CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue:
Total revenue	$ 11,580	$ 35,380	$ 29,390
Revenue, Product and Service [Extensible Enumeration]	Collaboration Revenue Member	Collaboration Revenue Member	Collaboration Revenue Member
Operating expenses:
Research and development	$ 423,144	$ 253,073	$ 186,948
General and administrative	75,621	40,586	30,450
Total operating expenses	498,765	293,659	217,398
Loss from operations	(487,185)	(258,279)	(188,008)
Other income (expense), net:
Interest income	47,482	9,154	929
Interest and other expense	(303)	0	(12)
Change in fair value of warrant liability and contingent earn-out shares	115	0	0
Total other income, net	47,294	9,154	917
Loss before income taxes	(439,891)	(249,125)	(187,091)
Benefit from income taxes	3,524	420	0
Net loss	$ (436,367)	$ (248,705)	$ (187,091)
Net loss per share attributable to common stockholders, basic	$ (3.86)	$ (3.08)	$ (2.57)
Net loss per share attributable to common stockholders, diluted	$ (3.86)	$ (3.08)	$ (2.57)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic	113,149,869	80,626,525	72,806,079
Weighted-average shares used to compute net loss per share attributable to common stockholders, diluted	113,149,869	80,626,525	72,806,079
Comprehensive loss:
Net Income (Loss)	$ (436,367)	$ (248,705)	$ (187,091)
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net	2,324	(1,404)	(492)
Comprehensive loss	$ (434,043)	$ (250,109)	$ (187,583)