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Income Taxes - Loss Before the Provision For (Benefit From) Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ (60,807) $ (50,133) $ (31,681)
International (8,145) (12,795) (6,879)
Loss before income taxes $ (68,952) $ (62,928) $ (38,560)