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DISCONTINUED OPERATIONS - Cash flow information (Details) - Uranium And Lithium Operations - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation and amortization | $ 38 | $ 67
Accretion of asset retirement obligations | 201 | 390
Impairment of uranium properties | 5,200 | 143
Discontinued Operations, Held-for-sale or Disposed of by Sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation and amortization | 38 | 67
Capital Expenditures | 81 |
Accretion of asset retirement obligations | 201 | 390
Discontinued Operations, Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Impairment of uranium properties | $ 5,200 | $ 143

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