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Other Assets - Other Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Furniture and fixtures, net of accumulated depreciation | $ 31 | $ 32
Lik project equipment, net of accumulated depreciation | 90 |
Exploration bonds and other assets | 4 | 4
Vendetta Warrants |  | 735
Total other assets | $ 125 | $ 771

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