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	$ 103,902	$ 44,865	$ 168,296	$ 92,293
General and administrative	11,922	8,571	23,437	18,420
Total operating expenses	115,824	53,436	191,733	110,713
Loss from operations	(115,824)	(53,436)	(191,733)	(110,713)
Interest expense	(1,137)	(874)	(2,404)	(1,737)
Interest income and other, net	6,210	6,473	12,248	13,029
Net loss before income tax	(110,751)	(47,837)	(181,889)	(99,421)
Income tax expense	(753)	(134)	(890)	(231)
Net loss	(111,504)	(47,971)	(182,779)	(99,652)
Other comprehensive income (loss):
Unrealized loss on marketable securities	(244)	(169)	(414)	(883)
Foreign currency translation adjustments	(19)	5	(27)	10
Total other comprehensive loss	(263)	(164)	(441)	(873)
Comprehensive loss	$ (111,767)	$ (48,135)	$ (183,220)	$ (100,525)
Net loss per share, basic	$ (0.71)	$ (0.48)	$ (1.2)	$ (1.02)
Net loss per share, diluted	$ (0.71)	$ (0.48)	$ (1.2)	$ (1.02)
Weighted-average shares used to compute net loss per share, basic	157,880,203	99,831,111	152,154,469	97,838,926
Weighted-average shares used to compute net loss per share, diluted	157,880,203	99,831,111	152,154,469	97,838,926