Condensed Consolidated Statements of Operations - 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	$ 194,179	$ 131,507	$ 342,313	$ 226,094
General and administrative	32,040	21,474	64,699	41,359
Total operating expenses	226,219	152,981	407,012	267,453
Loss from operations	(226,219)	(152,981)	(407,012)	(267,453)
Other income, net:
Interest income	31,073	23,813	64,008	45,479
Other income (expense)	28,573	465	35,713	(1,749)
Total other income, net	59,646	24,278	99,721	43,730
Net loss	$ (166,573)	$ (128,703)	$ (307,291)	$ (223,723)
Net loss per share, basic (in dollars per share)	$ (1.22)	$ (1.10)	$ (2.26)	$ (1.95)
Net loss per share, diluted (in dollars per share)	$ (1.22)	$ (1.10)	$ (2.26)	$ (1.95)
Weighted-average shares outstanding, basic (in shares)	136,033,746	117,256,561	135,863,299	114,473,758
Weighted-average shares outstanding, diluted (in shares)	136,033,746	117,256,561	135,863,299	114,473,758