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Intangible Assets - Schedule of Amortization Expense of Purchased Intangible Assets Expected to be Recognized (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 (remainder) $ 1,319  
2016 2,637  
2017 2,075  
2018 2,075  
2019 2,075  
Thereafter 8,450  
Net $ 18,631 $ 1,124