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Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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