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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 25, 2016 | Dec. 26, 2015
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Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 29,972 | $ 29,721
Accumulated amortization | (28,983) | (27,854)
Finite lived intangible assets, Net carrying amount | 989 | 1,867
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 16,325 | 16,098
Accumulated amortization | (15,436) | (14,387)
Finite lived intangible assets, Net carrying amount | 889 | 1,711
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,388 | 9,364
Accumulated amortization | (9,388) | (9,364)
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) | (1,903)
Finite lived intangible assets, Net carrying amount | 0 | 24
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (2,152) | (2,120)
Finite lived intangible assets, Net carrying amount | 100 | 132
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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