Segment Information - Summary of Additional Expense Details (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Research and Development Expense [Abstract]
Internal expenses	$ 7,751	$ 6,295	$ 15,597	$ 11,747
External expenses	22,058	8,350	37,569	14,603
Total	29,809	14,645	53,166	26,350
General and Administrative Expense [Abstract]
Internal expenses	5,514	5,467	9,336	10,630
External expenses	5,580	4,346	10,560	9,682
Total	11,094	9,813	19,896	20,312
Loss from operations	(40,903)	(24,458)	(73,062)	(46,662)
Total other income/(expense), net	(1,841)	18,604	6,970	(13,592)
Net loss	$ (42,744)	$ (5,854)	$ (66,092)	$ (60,254)