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Income Taxes - Schedule of Domestic and Foreign Components of Loss Before Income Tax Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. $ (11,353) $ (11,063) $ (31,115)
Non-U.S. (43) 162 (888)
Loss before income tax provision (benefit) $ (11,396) $ (10,901) $ (32,003)