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Income Taxes - Summary of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ (104,551) $ (103,836) $ (79,581)
International 3,925 22,265 4,870
Loss before income taxes $ (100,626) $ (81,571) $ (74,711)