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Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2012
Dec. 30, 2011
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount $ 13,787 $ 14,177
Amortizable intangible assets, Accumulated Amortization (11,645) (11,188)
Amortizable intangible assets, Net 2,142 2,989
Patents and Licenses [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 10,786 10,868
Amortizable intangible assets, Accumulated Amortization (9,875) (9,508)
Amortizable intangible assets, Net 911 1,360
Customer Relationships [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 1,835 2,023
Amortizable intangible assets, Accumulated Amortization (917) (809)
Amortizable intangible assets, Net 918 1,214
Developed technology [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 1,166 1,286
Amortizable intangible assets, Accumulated Amortization (853) (871)
Amortizable intangible assets, Net $ 313 $ 415