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Intangible Assets (Details) - USD ($)
$ in Thousands
Oct. 02, 2015
Jan. 02, 2015
Intangible assets:    
Long-lived intangible assets, Gross Carrying Amount $ 11,346 $ 11,334
Long-lived intangible assets, Accumulated Amortization (10,627) (10,464)
Long-lived intangible assets, Net 719 870
Patents and Licenses [Member]    
Intangible assets:    
Long-lived intangible assets, Gross Carrying Amount 9,208 9,205
Long-lived intangible assets, Accumulated Amortization (8,884) (8,859)
Long-lived intangible assets, Net 324 346
Customer relationships [Member]    
Intangible assets:    
Long-lived intangible assets, Gross Carrying Amount 1,307 1,302
Long-lived intangible assets, Accumulated Amortization (1,013) (911)
Long-lived intangible assets, Net 294 391
Developed technology [Member]    
Intangible assets:    
Long-lived intangible assets, Gross Carrying Amount 831 827
Long-lived intangible assets, Accumulated Amortization (730) (694)
Long-lived intangible assets, Net $ 101 $ 133