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Purchased Technology (Tables)
 12 Months Ended
Dec. 31, 2012
Purchased Technology [Abstract]  
Carrying value of the purchased technology
                 
    December 31,  
    2012     2011  
    (In thousands)  

Gross carrying amount

   $ —     $ 4,533  

Less, accumulated amortization

     —       3,695  

Less, impairment

     —       598  
   

 

 

    

 

 

  

Net book value

   $ —     $ —