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DISCONTINUED OPERATIONS - Cash flow information - (Details) - Uranium And Lithium Operations - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Depreciation and amortization | $ 30 | $ 20 | $ 36 | $ 66
Capital Expenditures |  |  | (101) |
Accretion of asset retirement obligations | 32 | $ 197 | 170 | $ 353
Discontinued Operations, Held-for-sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment of uranium properties | $ 5,200 |  | $ 5,200 |

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