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Fair Value Measurements - Summary of Information About Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Aug. 14, 2025
Feb. 06, 2025
Dec. 31, 2024
Liabilities:        
Earn-out Liability       $ 45,900
Fair Value, Inputs, Level 1        
Assets:        
Assets $ 20,884     29,806
Liabilities:        
Derivative liabilities 214,316     70,265
Fair Value, Inputs, Level 1 | Money market funds        
Assets:        
Cash equivalents 20,884     29,806
Fair Value, Inputs, Level 2        
Assets:        
Assets 532,805     174,323
Fair Value, Inputs, Level 2 | U.S. treasury securities        
Assets:        
Cash equivalents       24,835
Fair Value, Inputs, Level 2 | US treasury securities, short term        
Assets:        
Assets 420,850     124,420
Fair Value, Inputs, Level 2 | US treasury securities, long term        
Assets:        
Assets 111,955     25,068
Fair Value, Inputs, Level 3        
Liabilities:        
Derivative liabilities 26,421     68,727
Fair Value, Inputs, Level 3 | Earn-out liabilities        
Liabilities:        
Earn-out Liability       45,897
Sponsor Redemption Based Vesting Shares        
Liabilities:        
Earn-out Liability   $ 10,400    
Promote Sponsor Vesting Shares        
Liabilities:        
Earn-out Liability     $ 32,900  
Public Warrants | Fair Value, Inputs, Level 1 | Derivative        
Liabilities:        
Derivative liabilities 214,316     70,265
Private Warrants | Fair Value, Inputs, Level 3 | Derivative        
Liabilities:        
Derivative liabilities $ 26,421     $ 22,830