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Intangible Assets - Schedule of Amortization Expense of Purchased Intangible Assets Expected to be Recognized (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 (remainder) $ 623  
2016 2,492  
2017 1,930  
2018 1,930  
2019 1,930  
Thereafter 7,671  
Net $ 16,576 $ 1,124