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Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Income taxed at statutory rates | $ 36 | $ (2,250)
State Tax | 66 | (61)
Stock-based compensation | 50 | 84
Imputed interest | 9 | 20
Other adjustments | (1) | 82
Mining concessions disposition | 853 | 0
Inflation adjustment | (254) | 0
Prior year provision to actual adjustments | 885 | 475
Change in US tax rate | 29 | 0
Change in foreign tax rate | 100 | (1,361)
Differences in tax rates | (52) | (284)
Effect of foreign exchange | (1,236) | 66
Change in valuation allowance | (485) | 3,229
Income tax (benefit)/expense | $ 0 | $ 0

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