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GEOGRAPHIC AND SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Long-term assets by reportable segments |  |  |  |  |
Net property, plant and equipment | $ 20,414 |  | $ 20,414 |  | $ 20,337
Restricted cash | 3,807 |  | 3,807 |  | 3,797
Operating lease right-of-use assets | 424 |  | 424 |  | 484
Total long-term assets | 24,645 |  | 24,645 |  | 24,618
Statement of Operations, Loss before taxes |  |  |  |  |
Mineral property expenses | 576 | $ 808 | 1,178 | $ 1,426 |
Product development expenses | 175 | 16 | 301 | 32 |
General and administrative | 1,659 | 1,700 | 3,438 | 3,405 |
Arbitration expenses | 28 | 354 | 697 | 485 |
Accretion of asset retirement costs | 32 | 30 | 138 | 156 | 390
Depreciation and amortization | 17 | 25 | 30 | 48 |
Total operating expenses | 2,487 | 2,933 | 5,782 | 5,552 |
Loss from operations | (2,487) | (2,933) | (5,782) | (5,552) |
Other income (loss) | 20 | 158 | 28 | (397) |
Loss before taxes | (2,467) | (2,775) | (5,754) | (5,949) |
Corporate |  |  |  |  |
Long-term assets by reportable segments |  |  |  |  |
Net property, plant and equipment | 102 |  | 102 |  | 114
Operating lease right-of-use assets | 407 |  | 407 |  | 463
Total long-term assets | 509 |  | 509 |  | 577
Statement of Operations, Loss before taxes |  |  |  |  |
General and administrative | 1,094 | 1,216 | 2,283 | 2,364 |
Arbitration expenses | 28 | 354 | 697 | 485 |
Depreciation and amortization | 12 | 1 | 24 | 2 |
Total operating expenses | 1,134 | 1,571 | 3,004 | 2,851 |
Loss from operations | (1,134) | (1,571) | (3,004) | (2,851) |
Other income (loss) | 28 | 158 | 28 | (397) |
Loss before taxes | (1,106) | (1,413) | (2,976) | (3,248) |
Uranium |  |  |  |  |
Long-term assets by reportable segments |  |  |  |  |
Net property, plant and equipment | 11,340 |  | 11,340 |  | 11,251
Restricted cash | 3,797 |  | 3,797 |  | 3,787
Operating lease right-of-use assets | 17 |  | 17 |  | 21
Total long-term assets | 15,154 |  | 15,154 |  | 15,059
Statement of Operations, Loss before taxes |  |  |  |  |
Mineral property expenses | 570 | 805 | 1,172 | 1,358 |
General and administrative | 442 | 433 | 868 | 825 |
Accretion of asset retirement costs | 32 | 30 | 138 | 156 |
Depreciation and amortization | 5 | 24 | 6 | 46 |
Total operating expenses | 1,049 | 1,292 | 2,184 | 2,385 |
Loss from operations | (1,049) | (1,292) | (2,184) | (2,385) |
Other income (loss) | (8) |  |  |  |
Loss before taxes | (1,057) | (1,292) | (2,184) | (2,385) |
Lithium |  |  |  |  |
Statement of Operations, Loss before taxes |  |  |  |  |
Mineral property expenses |  | 2 |  | 3 |
Total operating expenses |  | 2 |  | 3 |
Loss from operations |  | (2) |  | (3) |
Loss before taxes |  | (2) |  | (3) |
Graphite |  |  |  |  |
Long-term assets by reportable segments |  |  |  |  |
Net property, plant and equipment | 8,972 |  | 8,972 |  | 8,972
Restricted cash | 10 |  | 10 |  | 10
Total long-term assets | 8,982 |  | 8,982 |  | $ 8,982
Statement of Operations, Loss before taxes |  |  |  |  |
Mineral property expenses | 6 | 1 | 6 | 65 |
Product development expenses | 175 | 16 | 301 | 32 |
General and administrative | 123 | 51 | 287 | 216 |
Total operating expenses | 304 | 68 | 594 | 313 |
Loss from operations | (304) | (68) | (594) | (313) |
Loss before taxes | $ (304) | $ (68) | $ (594) | $ (313) |

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