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Amortizable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2013
Dec. 28, 2012
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount $ 13,431 $ 13,787
Amortizable intangible assets, Accumulated Amortization (11,573) (11,645)
Amortizable intangible assets, Net 1,858 2,142
Patents and Licenses [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 10,712 10,786
Amortizable intangible assets, Accumulated Amortization (9,914) (9,875)
Amortizable intangible assets, Net 798 911
Customer Relationships [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 1,663 1,835
Amortizable intangible assets, Accumulated Amortization (873) (917)
Amortizable intangible assets, Net 790 918
Developed technology [Member]
    
Amortized intangible assets:    
Amortizable intangible assets, Gross Carrying Amount 1,056 1,166
Amortizable intangible assets, Accumulated Amortization (786) (853)
Amortizable intangible assets, Net $ 270 $ 313