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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible assets included operating costs and expenses      
Amortization of purchased intangible assets $ 1,074 $ 2,220 $ 179
Cost of net revenues [Member]
      
Intangible assets included operating costs and expenses      
Amortization of purchased intangible assets 1,623 4,102  
General and administrative expenses [Member]
      
Intangible assets included operating costs and expenses      
Amortization of purchased intangible assets $ 1,074 $ 2,220