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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
Domestic $ 2,538 $ (38,472) $ (80,735)
Foreign (79,180) (47,644) (39,819)
Loss before income taxes $ (76,642) $ (86,116) $ (120,554)