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Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income taxed at statutory rates	$ (3,743)	$ 36
State Tax	(21)	66
Stock-based compensation	33	50
Imputed interest	1	9
Other adjustments	0	(1)
Mining concessions disposition	0	853
Inflation adjustment	(2)	(254)
Prior year provision to actual adjustments	(493)	885
Change in U.S. tax rate	0	29
Change in foreign tax rate	0	100
Differentials in foreign tax rates	(186)	(52)
Changes in foreign exchange rates	911	(1,236)
Changes in valuation allowances affecting income tax expense or benefit	3,500	(485)
Income tax (benefit)/expense	0	$ 0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 326

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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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