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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017
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Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 34,584 | $ 32,584
Accumulated amortization | (30,448) | (30,378)
Finite lived intangible assets, Net carrying amount | 4,136 | 2,206
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 20,887 | 18,887
Accumulated amortization | (16,751) | (16,681)
Finite lived intangible assets, Net carrying amount | 4,136 | 2,206
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,438 | 9,438
Accumulated amortization | (9,438) | (9,438)
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) | (2,252)
Finite lived intangible assets, Net carrying amount | 0 | 0
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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