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Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Deferred income $ 1,937 $ 1,576
Other 138 172
Tax loss carryforwards 29,648 24,925
Deferred tax assets, gross 31,723 26,673
Valuation allowance (31,723) (26,673)
Deferred tax assets, net of valuation allowance 0 0
Net deferred income taxes $ 0 $ 0