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Fair Value Measurements - Schedule of Changes in the Estimated Fair Values (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning balance $ 60,920 $ 12,045 $ 12,045 $ 1,451
Issuance of SAFE     45,192 10,000
Fair value remeasurement     3,683 (126)
Correction of an immaterial       720
Ending balance     60,920 12,045
Secured Debt [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Issuance of second lien loans 43,865      
Exchange of SAFE for second lien loan 10,000      
Fair value remeasurement 23,938      
Settlement via conversion or exercise (67,380)      
Ending balance 10,423      
Simple Agreements For Future Equity [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning balance 59,301 10,000 10,000  
Issuance of SAFE 23,660 44,054 45,192 10,000
Exchange of SAFE for second lien loan (10,000)      
Fair value remeasurement 190,075   4,109  
Settlement via conversion or exercise (263,036)      
Ending balance 0 54,054 59,301 10,000
Redeemable Convertible Preferred Stock Warrants [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning balance 1,619 2,045 2,045 1,451
Fair value remeasurement 7,272 (321) (426) (126)
Correction of an immaterial       720
Reclassification of Assumed Kodiak Warrants (3,842)      
Settlement via conversion or exercise (5,049)      
Ending balance $ 0 $ 1,724 $ 1,619 $ 2,045