v3.26.1
COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 20 Months Ended
Mar. 24, 2026
USD ($)
Jul. 31, 2026
USD ($)
May 31, 2026
USD ($)
Apr. 30, 2026
USD ($)
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Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 18, 2026
USD ($)
Dec. 18, 2027
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Product Liability Contingency [Line Items]                    
Purchase obligation         $ 6,300 $ 6,300        
Bank guarantees         18,300 18,300        
Outstanding performance and payment bonds         88,200 88,200        
Bonds outstanding, other         8,700 8,700        
Asset retirement obligation         1,087 1,087       $ 1,035
Accretion expense         $ 27 $ 100        
McMurtre Project                    
Product Liability Contingency [Line Items]                    
Payments to acquire productive assets $ 300                  
McMurtre Project, Notice To Proceed Milestone                    
Product Liability Contingency [Line Items]                    
Loss contingency 5,600                  
McMurtre Project, Commercial Milestone                    
Product Liability Contingency [Line Items]                    
Loss contingency $ 1,400                  
NM Power and Data Center Project | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                    
Product Liability Contingency [Line Items]                    
Estimated cost for preliminary work       $ 7,500            
Non refundable deposit owed                 $ 500  
Area of land | a       486            
Non refundable assignment fee owed and paid       $ 800            
Land purchase, contingent service fee percentage per acquired tract       0.07            
NM Power and Data Center Project | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Forecast                    
Product Liability Contingency [Line Items]                    
Future payments to acquire land             $ 57,400 $ 120,100    
Power Generation Equipment Reservation | 2G Energy Inc.                    
Product Liability Contingency [Line Items]                    
Payment of reservation fee     $ 10,000              
Power Generation Equipment Reservation | 2G Energy Inc. | Subsequent Event                    
Product Liability Contingency [Line Items]                    
Payment of reservation fee   $ 17,000                
Payment of additional reservation fee   $ 7,000                
Measurement Input, Discount Rate                    
Product Liability Contingency [Line Items]                    
ARO discount rate (as percent)         0.108 0.108        
Letter of Credit                    
Product Liability Contingency [Line Items]                    
Letters of credit issued         $ 18,000 $ 18,000        
Minimum                    
Product Liability Contingency [Line Items]                    
Warranty liability term         2 years 2 years        
Maximum                    
Product Liability Contingency [Line Items]                    
Warranty liability term         3 years 3 years