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Income Taxes - Schedule of Domestic and Foreign Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Domestic $ (111,057) $ (53,930) $ (38,828)
Foreign (6,674)    
Loss before income taxes $ (117,731) $ (53,930) $ (38,828)