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Income Taxes - Loss before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
United States $ (12,497) $ (18,617) $ (20,983)
Foreign 5,526 5,159 2,502
Loss before provision for income taxes $ (6,971) $ (13,458) $ (18,481)