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Income Taxes - Loss Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Domestic $ (50,892) $ (55,330) $ (28,831)
Foreign 2,692 (2,665) 3,277
Loss before provision for income taxes $ (48,200) $ (57,995) $ (25,554)