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Income Taxes - Loss before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ (10,369) $ (12,497) $ (18,617)
Foreign 9,508 5,526 5,159
Loss before provision for income taxes $ (861) $ (6,971) $ (13,458)