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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ (72,846) $ (41,111) $ (39,754)
Foreign (24,017) (12,692) (15,325)
Loss before income taxes $ (96,863) $ (53,803) $ (55,079)