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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of income (loss) before income taxes by geographically      
Domestic $ (7,783) $ (13,993) $ (12,877)
Foreign 41 (228) (94)
Total $ (7,742) $ (14,221) $ (12,971)