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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
Domestic $ (66,411) $ (46,998) $ (3,107)
Foreign (19,126) (12,506) (11,836)
Loss before income taxes $ (85,537) $ (59,504) $ (14,943)