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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of income (loss) before income taxes by geographically      
Domestic $ (2,302) $ (4,459) $ (7,783)
Foreign (3,249) (823) 41
Total $ (5,551) $ (5,282) $ (7,742)