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Intangible Assets - Summary of Amortization Expenses of Purchased Intangible Assets (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangible assets $ 562,000 $ 1,074,000 $ 2,220,000
Cost of net revenues [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangible assets 334,000 1,623,000  
General and administrative expenses [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangible assets 562,000 1,074,000  
Total amortization expense [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Amortization of purchased intangible assets $ 896,000 $ 2,697,000