v3.26.1
Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Temporary Equity [Line Items]      
Research and development [1] $ 91,739 $ 57,864  
Customer | Accounts receivable | Customer concentration risk      
Temporary Equity [Line Items]      
Concentration risk, percentage 96.00% 85.00%  
Fair Value, Inputs, Level 1      
Temporary Equity [Line Items]      
Cash and cash equivalents $ 1,418,434   $ 1,550,925
Fair Value, Inputs, Level 2 | Ex-Im Credit Agreement      
Temporary Equity [Line Items]      
Long term notes payable, fair value 154,421   $ 155,507
GE Aerospace      
Temporary Equity [Line Items]      
Research and development 6,134    
Warrant expense 5,634    
Unrecognized compensation cost $ 55,529    
[1] Includes related party amounts of $5,634 and $0 attributable to warrant expense (research and development) and $87 and $(103) (general and administrative) for the three months ended March 31, 2026 and 2025, respectively (see Note 11).