Segment Information - Summary of Significant Segment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 4,288
Research and development program expense
Program expense	12,450	14,366	52,778	26,737
Consultants and contractors expense	5,290	2,913	14,536	9,385
Compensation expense	17,338	11,111	49,105	33,231
Other segment expense	4,050	4,343	11,758	16,079
Consolidated net loss	$ (39,128)	$ (32,733)	$ (128,177)	$ (81,144)