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Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 29, 2018 | Dec. 29, 2017
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Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | $ 11,572 | $ 11,521
Long-lived intangible assets, Accumulated Amortization | (11,313) | (11,250)
Long-lived intangible assets, Net | 259 | 271
Patents and licenses [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 9,255 | 9,244
Long-lived intangible assets, Accumulated Amortization | (8,996) | (8,973)
Long-lived intangible assets, Net | 259 | 271
Customer relationships [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 1,417 | 1,392
Long-lived intangible assets, Accumulated Amortization | (1,417) | (1,392)
Long-lived intangible assets, Net | 0 | 0
Developed technology [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 900 | 885
Long-lived intangible assets, Accumulated Amortization | (900) | (885)
Long-lived intangible assets, Net | $ 0 | $ 0

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