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Intangible assets, net
 9 Months Ended
Sep. 27, 2013
Intangible assets, net [Abstract]  
Intangible assets, net
(5)Intangible assets, net
 
The net carrying amounts of intangible assets as of September 27, 2013 and December 28, 2012 consisted of the following (in thousands):

 
 
September 27, 2013
  
December 28, 2012
 
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
  
(3,183
)
  
(2,833
)
Technology
  
(2,000
)
  
(2,000
)
Total
  
(5,183
)
  
(4,833
)
 
        
Net intangible assets subject to amortization
  
117
   
467
 
 
        
Intangible assets not subject to amortization (indefinite lives):
        
Tradename
  
2,600
   
2,600
 
 
        
Intangible assets, net
 
$
2,717
  
$
3,067
 

As of September 27, 2013, the weighted average useful life of intangible assets with finite lives was less than one year.  Amortization expense for intangible assets was $0.4 million for each of the nine months ended September 27, 2013 and September 28, 2012.