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FAIR VALUE ACCOUNTING - Narrative (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
 3 Months Ended
Dec. 05, 2023
shares
Nov. 29, 2023
USD ($)
Nov. 09, 2023
USD ($)
Oct. 19, 2023
CAD ($)
$ / shares
shares
Feb. 14, 2023
percentagepoint
Jan. 24, 2023
shares
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Change In Value Of Investments Accounted At Fair Value             $ 0 $ (2,959)
Convertible Note Receivable, Redeemed     $ 40,000          
Convertible Note Receivable, Consideration Received     21,000          
Convertible Note Receivable, Unpaid Accrued Interest     1,500          
Convertible Note Receivable, Sales Commission   $ 100            
Proceeds From Convertible Note Receivable     22,400          
Convertible Notes Receivable, Sold     $ 20,000          
Issuance of common shares for cash, net of issuance costs             $ 4,788 $ 0
IsoEnergy                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Subsidiary, Ownership Percentage, Parent 5.00%              
Private Placement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Price per share (in USD per share) | $ / shares       $ 4.50        
Issuance of common shares for cash, net of issuance costs       $ 1,830        
Number of shares available (in shares) | shares 8,501,424     8,134,500        
Sale of stock, number of shares issued (in shares) | shares       406,650        
Measurement Input, Price Volatility                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Notes Receivable, Fair Value Measurement Input | percentagepoint         0.60      
Measurement Input, Yield                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Notes Receivable, Fair Value Measurement Input | percentagepoint         0.095      
CUR                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Shares received per common stock share issued (in shares) | shares 0.500              
Virginia Energy Resources Inc. | CUR                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired           100.00%    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share | shares           0.26    
Business Combination, Number of Common Stock Shares Acquired | shares           9,439,857    
Business Combination, Acquired Shares Converted To Common Stock | shares           2,454,362    
Virginia Energy Resources Inc. | Energy Fuels                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Business Combination, Shares Converted Into Common Stock | shares           16,189,548    
CUR | Energy Fuels                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired           16.70%