CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating expenses:
Research and development	$ 224,134	$ 134,932	$ 429,883	$ 252,953
General and administrative	40,580	21,711	75,591	44,549
Total operating expenses	264,714	156,643	505,474	297,502
Loss from operations	(264,714)	(156,643)	(505,474)	(297,502)
Other income (expense), net:
Interest income	22,404	21,487	47,319	45,247
Interest and other income (expense), net	(899)	16	(909)	(2,793)
Change in fair value of warrant liabilities and contingent earn-out shares	(4,578)	1,907	(2,139)	5,812
Total other income, net	16,927	23,410	44,271	48,266
Loss before income taxes	(247,787)	(133,233)	(461,203)	(249,236)
Net loss	$ (247,787)	$ (133,233)	$ (461,203)	$ (249,236)
Net loss per share attributable to common stockholders, basic	$ (1.31)	$ (0.81)	$ (2.45)	$ (1.51)
Net loss per share attributable to common stockholders, diluted	$ (1.31)	$ (0.81)	$ (2.45)	$ (1.51)
Weighted-average common shares used to compute net loss per share, basic	188,583,288	165,141,936	188,365,805	164,935,542
Weighted-average common shares used to compute net loss per share, diluted	188,583,288	165,141,936	188,365,805	164,935,542
Comprehensive loss:
Net Income (Loss)	$ (247,787)	$ (133,233)	$ (461,203)	$ (249,236)
Other comprehensive loss:
Unrealized loss on investments, net	(405)	(665)	(19)	(2,407)
Comprehensive loss	$ (248,192)	$ (133,898)	$ (461,222)	$ (251,643)