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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
Domestic $ (101,234) $ (38,156) $ (66,411)
Foreign (24,648) (23,595) (19,126)
Loss before income taxes $ (125,882) $ (61,751) $ (85,537)