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Intangible Assets - Schedule of Amortization Expense of Purchased Intangible Assets Expected to be Recognized (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
2013 (remaining 6 months) $ 448  
2014 895  
2015 562  
2016 562  
Net $ 2,467 $ 2,915