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Intangible Assets (Details) - USD ($) $ in Thousands | Jul. 01, 2016 | Jan. 01, 2016
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Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | $ 11,799 | $ 11,341
Long-lived intangible assets, Accumulated Amortization | (11,140) | (10,675)
Long-lived intangible assets, Net | 659 | 666
Patents and Licenses [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 9,303 | 9,207
Long-lived intangible assets, Accumulated Amortization | (8,951) | (8,891)
Long-lived intangible assets, Net | 352 | 316
Customer relationships [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 1,526 | 1,305
Long-lived intangible assets, Accumulated Amortization | (1,297) | (1,044)
Long-lived intangible assets, Net | 229 | 261
Developed technology [Member] |  |
Long-lived intangible assets: |  |
Long-lived intangible assets, Gross Carrying Amount | 970 | 829
Long-lived intangible assets, Accumulated Amortization | (892) | (740)
Long-lived intangible assets, Net | $ 78 | $ 89

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