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TRANSACTIONS - Base Resources Acquisition (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2024 USD ($) shares | Aug. 16, 2024 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 16, 2024 USD ($) | Oct. 02, 2024 $ / shares | Dec. 19, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  | $ 1,690 |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Investing Activities |  |  |  | $ 16,830 | $ 0 | $ 0 |  |  |
Base Resources Limited [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Per Share Conversion of Base Resources Shares on Acquisition Date | shares | 0.0260 |  |  |  |  |  |  |  |
Total EFI Equity Consideration in Base Combination | $ 178,438 |  |  |  |  |  |  |  |
Partners' Capital, Distribution Amount Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.065 |
Base Resources Special Dividend | 55,080 |  |  |  |  |  |  |  |
Total purchase price | $ 178,438 |  |  |  |  |  |  |  |
Base Resources Limited [Member] | Toliara Project Asset Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Payment of Deferred Consideration |  |  |  |  |  |  | $ 16,830 |  | $ 170
Total purchase price |  |  | $ 75,000 |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 85.00% |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  | $ 17,000 |  |  |  |  |  |

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