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Amortizable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2012
Dec. 30, 2011
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount $ 14,177 $ 14,177
Amortizable intangible assets, Accumulated Amortization (11,719) (11,188)
Amortizable intangible assets, Net 2,458 2,989
Patents and Licenses [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 10,868 10,868
Amortizable intangible assets, Accumulated Amortization (9,835) (9,508)
Amortizable intangible assets, Net 1,033 1,360
Customer Relationships [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 2,023 2,023
Amortizable intangible assets, Accumulated Amortization (961) (809)
Amortizable intangible assets, Net 1,062 1,214
Developed technology [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 1,286 1,286
Amortizable intangible assets, Accumulated Amortization (923) (871)
Amortizable intangible assets, Net $ 363 $ 415