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Income Taxes - Domestic and Foreign (Loss)/Income Before Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Domestic $ (55,900) $ (22,037) $ (63,421)
Foreign (15,670) (16,449) 410
Loss before provision for income taxes $ (71,570) $ (38,486) $ (63,011)