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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Net property, plant and equipment | $ 20,505 |  | $ 20,505 |  | $ 20,553
Restricted cash | 3,768 |  | 3,768 |  | 3,732
Notes receivable, non-current |  |  |  |  | 1,493
Operating lease right of use assets | 541 |  | 541 |  |
Total long-term assets | 24,814 |  | 24,814 |  | 25,778
Mineral property expenses | 824 | $ 969 | 1,458 | $ 1,751 |
General and administrative | 2,054 | 2,054 | 3,890 | 3,859 |
General and administrative expenses | 2,061 |  | 3,879 |  |
Sales and marketing expenses | 7 |  | 11 |  |
Acquisition related expenses |  | (422) |  | 333 |
Accretion of asset retirement costs | 30 | 134 | 156 | 268 | 993
Impairment of uranium properties |  | 17,968 |  | 17,968 |
Depreciation and amortization | 25 | 33 | 48 | 67 |
Total operating expenses | 2,933 | 20,736 | 5,552 | 24,246 |
Loss from operations | (2,933) | (20,736) | (5,552) | (24,246) |
Other (expense) income | 158 | 279 | (397) | 370 |
Loss before taxes | (2,775) | (20,457) | (5,949) | (23,876) |
Corporate |  |  |  |  |
Net property, plant and equipment | 138 |  | 138 |  | 162
Operating lease right of use assets | 517 |  | 517 |  |
Total long-term assets | 655 |  | 655 |  | 162
General and administrative |  | 1,364 |  | 2,717 |
General and administrative expenses | 1,570 |  | 2,849 |  |
Acquisition related expenses |  | (422) |  | 333 |
Depreciation and amortization | 1 | 1 | 2 | 2 |
Total operating expenses | 1,571 | 943 | 2,851 | 3,052 |
Loss from operations | (1,571) | (943) | (2,851) | (3,052) |
Other (expense) income | 158 | 172 | (397) | 253 |
Loss before taxes | (1,413) | (771) | (3,248) | (2,799) |
Uranium |  |  |  |  |
Net property, plant and equipment | 11,395 |  | 11,395 |  | 11,418
Restricted cash | 3,758 |  | 3,758 |  | 3,722
Notes receivable, non-current |  |  |  |  | 1,493
Operating lease right of use assets | 24 |  | 24 |  |
Total long-term assets | 15,177 |  | 15,177 |  | 16,633
Mineral property expenses | 805 | 830 | 1,358 | 1,604 |
General and administrative |  | 453 |  | 905 |
General and administrative expenses | 433 |  | 825 |  |
Accretion of asset retirement costs | 30 | 134 | 156 | 268 |
Impairment of uranium properties |  | 17,968 |  | 17,968 |
Depreciation and amortization | 24 | 31 | 46 | 64 |
Total operating expenses | 1,292 | 19,416 | 2,385 | 20,809 |
Loss from operations | (1,292) | (19,416) | (2,385) | (20,809) |
Other (expense) income |  | 107 |  | 117 |
Loss before taxes | (1,292) | (19,309) | (2,385) | (20,692) |
Lithium |  |  |  |  |
Mineral property expenses | 2 | 130 | 3 | 138 |
Total operating expenses | 2 | 130 | 3 | 138 |
Loss from operations | (2) | (130) | (3) | (138) |
Loss before taxes | (2) | (130) | (3) | (138) |
Graphite |  |  |  |  |
Net property, plant and equipment | 8,972 |  | 8,972 |  | 8,973
Restricted cash | 10 |  | 10 |  | 10
Total long-term assets | 8,982 |  | 8,982 |  | $ 8,983
Mineral property expenses | 17 | 9 | 97 | 9 |
General and administrative |  | 237 |  | 237 |
General and administrative expenses | 58 |  | 205 |  |
Sales and marketing expenses | 7 |  | 11 |  |
Depreciation and amortization |  | 1 |  | 1 |
Total operating expenses | 68 | 247 | 313 | 247 |
Loss from operations | (68) | (247) | (313) | (247) |
Loss before taxes | $ (68) | $ (247) | $ (313) | $ (247) |

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