Annual report pursuant to Section 13 and 15(d)

Income Taxes - deferred tax components (Details)

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Income Taxes - deferred tax components (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes      
Deferred tax assets $ 9,650 $ 10,162 $ 9,617
Net operating loss carry forwards 30,883 27,554 30,250
Less: valuation allowance (40,533) (37,716) (39,867)
Net future income tax assets