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Acquired Intangible Assets - Schedule of Expected Amortization Expense in Future Periods (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, net $ 9,751 $ 0 [1]
Purchased Technology [Member]
   
Finite-Lived Intangible Assets [Line Items]    
2014 (remaining 3 months) 352  
2015 1,408  
2016 1,408  
2017 1,408  
2018 1,408  
Thereafter 3,767  
Acquired intangible assets, net $ 9,751  
[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.