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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Component of property and equipment    
Less: accumulated depreciation and amortization $ (8,557) $ (8,325)
Property and equipment, net 483 325
Equipment [Member]
   
Component of property and equipment    
Property and equipment, gross 6,762 6,372
Leasehold Improvements [Member]
   
Component of property and equipment    
Property and equipment, gross $ 2,278 $ 2,278