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GEOGRAPHIC AND SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Net property, plant and equipment | $ 20,529 |  | $ 20,553 | $ 35,409
Restricted cash | 3,750 |  | 3,732 | 3,668
Notes receivable, non-current |  |  | 1,493 | 3,328
Operating lease right of use assets, non-current | 569 |  |  |
Total long-term assets | 24,848 |  | 25,778 | 42,400
Mineral property expenses | 634 | $ 782 | 3,538 | 4,584
General and administrative | 1,836 | 1,805 | 7,357 | 6,614
General and administrative | 1,818 |  |  |
Sales and marketing expenses | 18 |  |  |
Acquisition related expenses |  | 755 | 600 | 1,003
Accretion of asset retirement costs | 126 | 134 | 993 | 1,039
Depreciation and amortization | 23 | 34 | 116 | 142
Total operating expenses | 2,619 | 3,510 | 36,049 | 24,818
Loss from operations | 2,619 | 3,510 |  |
Other income | (555) | 91 | 365 | $ 5,530
Loss before taxes | (3,174) | (3,419) |  |
Corporate |  |  |  |
Net property, plant and equipment | 150 |  | 162 |
Operating lease right of use assets, non-current | 543 |  |  |
Total long-term assets | 693 |  | 162 |
General and administrative |  | 1,353 |  |
General and administrative | 1,279 |  |  |
Acquisition related expenses |  | 755 |  |
Depreciation and amortization | 1 | 1 |  |
Loss from operations | 1,280 | 2,109 |  |
Other income | (555) | 81 |  |
Loss before taxes | (1,835) | (2,028) |  |
Uranium |  |  |  |
Net property, plant and equipment | 11,407 |  | 11,418 |
Restricted cash | 3,740 |  | 3,722 |
Notes receivable, non-current |  |  | 1,493 |
Operating lease right of use assets, non-current | 26 |  |  |
Total long-term assets | 15,173 |  | 16,633 |
Mineral property expenses | 553 | 774 |  |
General and administrative |  | 452 |  |
General and administrative | 392 |  |  |
Accretion of asset retirement costs | 126 | 134 |  |
Depreciation and amortization | 22 | 33 |  |
Loss from operations | 1,093 | 1,393 |  |
Other income |  | 10 |  |
Loss before taxes | (1,093) | (1,383) |  |
LithiumMember10Q |  |  |  |
Mineral property expenses | 1 | 8 |  |
Loss from operations | 1 | 8 |  |
Loss before taxes | (1) | $ (8) |  |
Graphite |  |  |  |
Net property, plant and equipment | 8,972 |  | 8,973 |
Restricted cash | 10 |  | 10 |
Total long-term assets | 8,982 |  | $ 8,983 |
Mineral property expenses | 80 |  |  |
General and administrative | 147 |  |  |
Sales and marketing expenses | 18 |  |  |
Loss from operations | 245 |  |  |
Loss before taxes | $ (245) |  |  |

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