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Income Taxes - Components of Income/(Loss) Before Income Tax Provision (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
U.S. $ (12,240) $ (21,915)
Foreign (394) (771)
Income/(loss) before income tax provision (benefit) $ (12,634) $ (22,686)