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Geographic and Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Net property, plant and equipment | $ 35,409 | $ 46,916
Restricted cash | 3,668 | 3,964
Notes receivable, non-current | 3,328 |
Total long-term assets |  | 2,123
Mineral property expenses | (4,584) | (3,248)
General and administrative | (6,614) | (7,650)
Accretion of asset retirement costs | (1,039) | (480)
Depreciation and amortization | (142) | (247)
Impairment of Uranium properties | (11,436) | (1,673)
Total operating expenses | (24,818) | (13,298)
Other income (expense) | 5,530 | (6,307)
Long Term Assets [Member] |  |
Net property, plant and equipment | 35,409 | 46,916
Restricted cash | 3,668 | 3,964
Notes receivable, non-current | 3,328 | 2,123
Total long-term assets | 42,405 | 53,003
Operating Results [Member] |  |
Mineral property expenses | 4,584 | 3,248
General and administrative | 6,614 | 7,650
Acquisition related expenses | 1,003 |
Accretion of asset retirement costs | 1,039 | 480
Depreciation and amortization | 142 | 247
Impairment of Uranium properties | 11,436 | 1,673
Total operating expenses | 24,818 | 13,298
Loss from operations | (24,818) | (13,298)
Other income (expense) | 5,530 | (6,307)
Loss before taxes | (19,288) | (19,605)
Corporate [Member] | Long Term Assets [Member] |  |
Net property, plant and equipment | 211 | 141
Restricted cash |  |
Notes receivable, non-current | 834 |
Total long-term assets | 1,045 | 141
Corporate [Member] | Operating Results [Member] |  |
Mineral property expenses |  |
General and administrative | 4,783 | 5,573
Acquisition related expenses | 1,003 |
Accretion of asset retirement costs |  |
Depreciation and amortization | 5 | 8
Impairment of Uranium properties |  |
Total operating expenses | 5,791 | 5,581
Loss from operations | (5,791) | (5,581)
Other income (expense) | 585 | (6,339)
Loss before taxes | (5,206) | (11,920)
Uranium [Member] | Long Term Assets [Member] |  |
Net property, plant and equipment | 35,198 | 46,775
Restricted cash | 3,668 | 3,964
Notes receivable, non-current | 2,494 | 2,123
Total long-term assets | 41,360 | 52,862
Uranium [Member] | Operating Results [Member] |  |
Mineral property expenses | 3,383 | 2,441
General and administrative | 1,831 | 2,077
Acquisition related expenses |  |
Accretion of asset retirement costs | 1,039 | 480
Depreciation and amortization | 137 | 239
Impairment of Uranium properties | 11,436 | 1,673
Total operating expenses | 17,826 | 6,910
Loss from operations | (17,826) | (6,910)
Other income (expense) | 4,944 | 32
Loss before taxes | (12,882) | (6,878)
Lithium [Member] | Long Term Assets [Member] |  |
Net property, plant and equipment |  |
Restricted cash |  |
Notes receivable, non-current |  |
Total long-term assets |  |
Lithium [Member] | Operating Results [Member] |  |
Mineral property expenses | 1,201 | 807
General and administrative |  |
Acquisition related expenses |  |
Accretion of asset retirement costs |  |
Depreciation and amortization |  |
Impairment of Uranium properties |  |
Total operating expenses | 1,201 | 807
Loss from operations | (1,201) | (807)
Other income (expense) | 1 |
Loss before taxes | $ (1,200) | $ (807)

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