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Debt (Details)
$ / shares in Units, pound_of_uranium in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2024
shares
Dec. 31, 2024
USD ($)
pound_of_uranium
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 14, 2023
USD ($)
$ / shares
Debt Instrument [Line Items]          
Interest expense   $ 1,735,000 $ 3,503,000    
Repayments of convertible debt   0 40,000,000 $ 0  
Convertible debt          
Debt Instrument [Line Items]          
Shares issued for conversion of convertible debt (in shares) | shares 6,872,143        
Secured Convertible Notes due February 2025 | Convertible debt          
Debt Instrument [Line Items]          
Face amount         $ 60,000,000
Conversion price (in USD per share) | $ / shares         $ 2.9103
Interest rate (as a percent)         8.00%
Premium related to conversion         $ 3,813,000
Debt instrument fair value         $ 56,187,000
Accretion expense     3,052,000    
Repayments of convertible debt     40,000,000    
Convertible debt     $ 19,239,000    
Shares issued for conversion of convertible debt (in shares) | shares 6,872,143        
Uranium Loan | Notes payable          
Debt Instrument [Line Items]          
Face amount   $ 20,108,000      
Uranium Loan | pound_of_uranium   200      
Interest rate of funds borrowed (as a percent)   9.00%      
Term of loan agreement   12 months      
Accrued interest   $ 1,531,000