CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating expenses:
Research and development	$ 83,608	$ 74,418
General and administrative	35,799	20,394
Total operating expenses	119,407	94,812
Loss from operations	(119,407)	(94,812)
Other income (expense)
Change in fair value of related party revenue share liability	(2,570)	(1,430)
Interest income and other income (expense), net	12,866	11,817
Total other income (expense), net	10,296	10,387
Loss before income taxes	(109,111)	(84,425)
Income tax provision	168	157
Net loss	$ (109,279)	$ (84,582)
Net loss per share attributable to Class A and Class B common stockholders, basic	$ (1.39)	$ (1.18)
Net loss per share attributable to Class A and Class B common stockholders, diluted	$ (1.39)	$ (1.18)
Weighted average shares of Class A and Class B common stock outstanding, basic	78,670,371	71,607,546
Weighted average shares of Class A and Class B common stock outstanding, diluted	78,670,371	71,607,546
Comprehensive loss:
Net loss	$ (109,279)	$ (84,582)
Other comprehensive income (loss)
Unrealized gains (losses) on marketable securities	(3,708)	913
Comprehensive loss	$ (112,987)	$ (83,669)