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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
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
Domestic $ (195,617) $ 2,538 $ (38,472)
Foreign 6,686 (79,180) (47,644)
Loss before income taxes $ (188,931) $ (76,642) $ (86,116)