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Amortizable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2012
Dec. 30, 2011
Amortized intangible assets:    
Amortizable Intangible Assets, Gross Carrying Amount $ 14,080 $ 14,177
Amortizable Intangible Assets, Accumulated Amortization 11,495 (11,188)
Amortizable intangible assets, Net 2,585 2,989
Patents and Licenses [Member]
    
Amortized intangible assets:    
Amortizable Intangible Assets, Gross Carrying Amount 10,848 10,868
Amortizable Intangible Assets, Accumulated Amortization (9,721) (9,508)
Amortizable intangible assets, Net 1,127 1,360
Customer Relationships [Member]
    
Amortized intangible assets:    
Amortizable Intangible Assets, Gross Carrying Amount 1,976 2,023
Amortizable Intangible Assets, Accumulated Amortization (889) (809)
Amortizable intangible assets, Net 1,087 1,214
Developed technology [Member]
    
Amortized intangible assets:    
Amortizable Intangible Assets, Gross Carrying Amount 1,256 1,286
Amortizable Intangible Assets, Accumulated Amortization (885) (871)
Amortizable intangible assets, Net $ 371 $ 415