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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Loss carryovers | $ 12,178 | $ 8,168
Investment in Mineral Property | 1,952 |
Capitalized Exploration Costs | 1,205 |
Stock option compensation expense | 13 |
Royalty | 989 | 1,482
Unrealized loss on derivative securities | 28 |
Other | 135 | 105
Valuation allowance | (16,249) | (9,118)
Total deferred tax assets | 251 | 637
Deferred tax liabilities: |  |
Unrealized gain on derivative securities |  | 196
Unrealized gains on marketable equity securities | 230 | 395
Other | 21 | 46
Total deferred tax liabilities | 251 | 637
Net deferred tax liabilities |  |

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