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Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax benefit $ (6) $ (6)  
Income Taxes (Textual) [Abstract]      
Unrecognized tax benefits 9,400   $ 9,300
Unrecognized tax benefits that would impact effective tax rate 322   332
Accrued for interest and penalties 43   $ 56
Reduction in gross unrecognized tax benefits $ 13