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Income Taxes - Loss Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ (97,938) $ (155,375) $ (81,931)
Foreign 1,862 2,727 1,260
Loss before provision for income taxes $ (96,076) $ (152,648) $ (80,671)