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Federal Income Taxes - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 11,666 | $ 56,781
Mineral properties | 10,301 | 7,237
Accrued vacation | 22 | 17
Reclamation provision | 149 | 224
Capital loss carryforwards | 728 | 1,013
Restoration reserves | 1,154 | 980
Capitalized transaction costs | 1,168 | 912
Other | 4,492 | 4,123
Deferred tax assets | 29,680 | 71,287
Valuation allowance | (29,063) | (68,121)
Net deferred tax assets | 617 | 3,166
Derivatives | (590) | (590)
Mineral properties, Turkey |  | (1,437)
Securities | (27) | (106)
Property, plant and equipment |  | (1,033)
Deferred tax liabilities | (617) | (3,166)
Net deferred tax asset (liability) |  |

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