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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
Domestic $ (38,472) $ (80,735) $ (25,342)
Foreign (47,644) (39,819) (32,797)
Loss before income taxes $ (86,116) $ (120,554) $ (58,139)