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Variable Interest Entities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]        
Total assets $ 224,798 $ 85,908    
Total liabilities 229,335 137,480 $ 159,482 $ 117,895
SNS        
Variable Interest Entity [Line Items]        
Total assets 27,000 13,700    
Total liabilities $ 22,800 12,000    
SNS        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage 90.00%      
Variable interest entity, profits interest, percent 47.00%      
IX LLC JV        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage 51.00%      
LLC & KBR        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage 10.00%      
KBR, Inc.        
Variable Interest Entity [Line Items]        
Variable interest entity, profits interest, percent 53.00%      
IX LLC JV        
Variable Interest Entity [Line Items]        
Total assets $ 0 0    
Total liabilities $ 0 $ 0    
X-energy | IX LLC JV        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage 49.00%