Segment Reporting - Schedule of Significant Expenses Provided to the CODM on a Regular Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Stock-based compensation	$ 12,806	$ 8,859
Net loss	69,005	44,773
Gain on sale of in-process research and development asset	30,000	0
Increase (decrease) in fair value of contingent value right liability	30,300	(2,400)
Related Party
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Stock-based compensation	300	300
Research and development, excluding compensation and share-based compensation	3,100	2,500
Operating Segments | Reportable Segment
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Compensation	11,443	6,991
Stock-based compensation	12,806	8,859
Research and development, excluding compensation and share-based compensation	46,893	33,551
Other segment items	(2,137)	(4,628)
Net loss	$ 69,005	$ 44,773