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Segment Information - Summary of Reportable Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting [Abstract]      
Revenue $ 45,951 $ 1,075  
Employee-related expenses, excluding stock-based compensation 33,468 22,233  
Stock-based compensation 8,476 3,152  
External research and development expenses 53,519 32,786  
External general and administrative expenses 8,856 6,511  
Gain on sale of non-financial asset (12,500) 0  
Other segment expenses 22,429 17,216  
Total operating expenses 114,248 81,898  
Loss from operations (68,297) (80,823)  
Other income, net 19,430 8,527  
Loss before provision (benefit) for income taxes (48,867) (72,296) $ (48,867)
Provision (benefit) for income taxes 12 (498)  
Net loss $ (48,879) $ (71,798)