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Segments - Summary of Significant Expense and Asset Categories (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Operating expenses:                
Research and development $ 6,121   $ 2,327   $ 11,804 $ 5,003    
General and administrative 5,671   1,344   11,326 2,577    
Total operating expenses 11,792   3,671   23,130 7,580    
Net operating loss (11,792)   (3,671)   (23,130) (7,580)    
Other segment items                
Interest income 954   104   1,884 222    
Interest expense     (9)     (17)    
Other income (expense), net (9)   1   (9) 1    
Net loss (10,847) $ (10,408) (3,575) $ (3,799) (21,255) (7,374)    
Assets:                
Cash and cash equivalents $ 105,462   $ 9,384   $ 105,462 $ 9,384 $ 94,851 $ 9,792