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Fair Value - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2025
USD ($)
Dec. 31, 2024
USD ($)
yr
Oct. 01, 2024
USD ($)
Dec. 31, 2025
USD ($)
yr
Sep. 30, 2025
USD ($)
yr
May 15, 2025
Apr. 14, 2025
Oct. 22, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Conversion of AFX available-for-sale term loan into equity method investments   $ 0 $ 0 $ 8,757        
Convertible debt | Convertible Promissory Notes Due 2025                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Interest Rates   8.00%            
August 2025 Notes | Convertible debt                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Embedded Derivative, Fair Value of Embedded Derivative Liability         $ 1,677      
AeroFlexx                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Conversion of AFX available-for-sale term loan into equity method investments $ 7,300              
WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrant term               4 years
2024 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash amount warrants may be exchanged for               $ 15,000
Dividend Yield                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Earnout shares, measurement input       0        
Stock price                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Earnout shares, measurement input   13.85   4.18        
Embedded derivative, measurement input         36.49      
Stock price | 2025 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants, measurement input             3.65  
Stock price | 2024 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants, measurement input   13.85   4.18        
Volatility                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Earnout shares, measurement input   0.5600   0.6000        
Embedded derivative, measurement input         0.7000      
Volatility | 2025 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants, measurement input             0.5700  
Volatility | 2024 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants, measurement input   0.5600   0.6000        
Credit spread | 2025 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants, measurement input             0.2770  
Credit spread | 2024 WTI Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants, measurement input   0.1880   0.2600        
Risk-free rate                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Earnout shares, measurement input   0.0442   0.0377        
Embedded derivative, measurement input         0.0366      
Time to liquidity                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Earnout shares, measurement input | yr   6.8   5.8        
Embedded derivative, measurement input | yr         4.25      
Debt yield                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Embedded derivative, measurement input           0.426 0.445