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Intangible assets, net
12 Months Ended
Dec. 28, 2012
Intangible assets, net [Abstract]  
Intangible assets, net
(5)           Intangible assets, net

Intangible assets as of December 28, 2012 and December 30, 2011 consisted of the following (in thousands):
  
   
2012
  
2011
 
Intangible assets subject to amortization  (definite lives):
      
Customer relationships
 $3,300  $3,300 
Technology
  2,000   2,000 
Total
  5,300   5,300 
          
Accumulated amortization:
        
Customer relationships
  (2,833)  (2,365)
Technology
  (2,000)  (2,000)
Total
  (4,833)  (4,365)
          
Net intangible assets subject to amortization
  467   935 
          
Intangible assets not subject to amortization (indefinite lives):
        
Tradename
  2,600   2,600 
          
Intangible assets, net
 $3,067  $3,535 
 
As of December 28, 2012, the weighted average useful life of intangible assets with finite lives was approximately one year.  Amortization expense for intangible assets was approximately $0.5 million, $1.3 million and $2.3 million for the years ended December 28, 2012, December 30, 2011, and December 31, 2010, respectively.