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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014
--- | --- | ---
Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 29,721 | $ 30,670
Accumulated amortization | (27,854) | (26,376)
Finite lived intangible assets, Net carrying amount | 1,867 | 4,294
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 16,098 | 16,950
Accumulated amortization | (14,387) | (12,991)
Finite lived intangible assets, Net carrying amount | 1,711 | 3,959
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,364 | 9,461
Accumulated amortization | (9,364) | (9,449)
Finite lived intangible assets, Net carrying amount | 0 | 12
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,903) | (1,802)
Finite lived intangible assets, Net carrying amount | 24 | 125
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (2,120) | (2,054)
Finite lived intangible assets, Net carrying amount | 132 | 198
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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