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Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Deferred income | $ 1,891 | $ 1,937
Other | 149 | 138
Tax loss carryforwards | 32,487 | 29,648
Deferred tax assets, gross | 34,527 | 31,723
Valuation allowance | (34,527) | (31,723)
Deferred tax assets, net of valuation allowance | 0 | 0
Net deferred income taxes | $ 0 | $ 0

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