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Intangible Assets - Summary of Amortization Expenses of Purchased Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 141 $ 141 $ 281 $ 281
Cost of net revenues [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 83 83 167 167
General and administrative expenses [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets 141 141 281 281
Total amortization expense [Member]
        
Finite-Lived Intangible Assets [Line Items]        
Amortization of purchased intangible assets $ 224 $ 224 $ 448 $ 448