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FAIR VALUE ACCOUNTING - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) percentagepoint | Feb. 14, 2023 percentagepoint | Jan. 24, 2023 shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Change In Value Of Investments Accounted At Fair Value |  |  |  | $ 8,890 | $ 3,121 |  | $ 6,701 | $ (13,716) |
Convertible Note, decrease in fair value |  |  |  |  |  | $ (6,610) |  |  |
Measurement Input, Price Volatility |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Notes Receivable, Fair Value Measurement Input | percentagepoint | 0.55 | 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 | 0.103 | 0.095 |  |  |  |  |  |  |
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% |  |  |  |  |  |
Virginia Energy Resources Inc. |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Percentage Of Fair Value Investment |  |  |  |  |  |  |  |  | 13.50%
Virginia Energy Resources Inc. | Level 1 |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Investments accounted for at fair value |  |  |  |  |  |  |  |  | $ 2,830
Consolidated Uranium Inc. |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Percentage Of Fair Value Investment |  |  |  |  |  |  | 15.70% |  | 17.40%
Investments accounted for at fair value | $ 26,070 |  |  | $ 26,070 |  |  | $ 26,070 |  |
Consolidated Uranium Inc. | Level 1 |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Investments accounted for at fair value |  |  |  |  |  |  |  |  | $ 16,500

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