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Segments - Summary of Significant Expense and Asset Categories (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Operating expenses:                    
Research and development $ 10,328     $ 3,112     $ 22,132 $ 8,115    
General and administrative 6,478     1,507     17,804 4,084    
Total operating expenses 16,806     4,619     39,936 12,199    
Net operating loss (16,806)     (4,619)     (39,936) (12,199)    
Other segment items                    
Interest income 1,017     665     2,901 887    
Interest expense       (7)       (24)    
Other income (expense), net (15)     (0)     (24)      
Net loss (15,804) $ (10,847) $ (10,408) (3,961) $ (3,575) $ (3,799) (37,059) (11,335)    
Assets:                    
Cash and cash equivalents $ 99,369     $ 98,311     $ 99,369 $ 98,311 $ 94,851 $ 9,792