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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
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Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 32,584 | $ 29,307
Accumulated amortization | (30,378) | (28,895)
Finite lived intangible assets, Net carrying amount | 2,206 | 412
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 18,887 | 15,726
Accumulated amortization | (16,681) | (15,380)
Finite lived intangible assets, Net carrying amount | 2,206 | 346
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,438 | 9,322
Accumulated amortization | (9,438) | (9,322)
Finite lived intangible assets, Net carrying amount | 0 | 0
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,927) | (1,927)
Finite lived intangible assets, Net carrying amount | 0 | 0
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (2,252) | (2,186)
Finite lived intangible assets, Net carrying amount | 0 | 66
Trademark [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 80 | 80
Accumulated amortization | (80) | (80)
Finite lived intangible assets, Net carrying amount | $ 0 | $ 0

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