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Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 29, 2017 | Dec. 30, 2016
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Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | $ 11,524 | $ 11,421
Long-lived intangible assets, Accumulated Amortization | (11,198) | (10,948)
Long-lived intangible assets, Net | 326 | 473
Patents and Licenses [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 9,245 | 9,224
Long-lived intangible assets, Accumulated Amortization | (8,965) | (8,930)
Long-lived intangible assets, Net | 280 | 294
Customer relationships [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 1,393 | 1,343
Long-lived intangible assets, Accumulated Amortization | (1,359) | (1,209)
Long-lived intangible assets, Net | 34 | 134
Developed technology [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 886 | 854
Long-lived intangible assets, Accumulated Amortization | (874) | (809)
Long-lived intangible assets, Net | $ 12 | $ 45

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