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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2025
Operating Loss Carryforwards [Line Items]        
Income tax provision $ 0 $ 0   $ 0
Effective tax rate 0.00% 0.00% 0.00% 0.00%
Research and development $ 2,473 [1] $ 20,347 [1] $ 14,034 [2] $ 43,059 [1]
Uncertain tax positions     0  
Accrued interest or penalties related to uncertain tax positions   $ 0 0 $ 0
Domestic Tax Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards     2,000  
State and Local Jurisdiction (less than)        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards     $ 500  
[1] Includes related party amount of $6,175 and $21,244 for the three and nine months ended September 30, 2025, respectively, and $2,473 for the period from September 19, 2024 (inception) through September 30, 2024.
[2] Includes related party amount of $13,185 for the period from September 19, 2024 (inception) to December 31, 2024 (see Note 12).