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Acquired Intangible Assets - Schedule of Expected Amortization Expense in Future Periods (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Acquired intangible assets, net $ 10,465 $ 0
Acquired Technology [Member]
   
Finite-Lived Intangible Assets [Line Items]    
2014 1,056  
2015 1,408  
2016 1,408  
2017 1,408  
2018 1,408  
Thereafter 3,777  
Acquired intangible assets, net $ 10,465