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Intangible Assets - Summary of Amortization Expenses of Purchased Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 141 $ 141 $ 421 $ 422
Cost of Net Revenues [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 83 83 250 250
General and Administrative Expenses [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 141 141 421 422
Total Amortization Expense [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 224 $ 224 $ 671 $ 672