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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 26, 2015 | Dec. 27, 2014
--- | --- | ---
Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 29,946 | $ 30,670
Accumulated amortization | (27,543) | (26,376)
Net carrying amount | 2,403 | 4,294
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 16,299 | 16,950
Accumulated amortization | (14,094) | (12,991)
Net carrying amount | 2,205 | 3,959
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,388 | 9,461
Accumulated amortization | (9,388) | (9,449)
Net carrying amount | 0 | 12
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,877) | (1,802)
Net carrying amount | 50 | 125
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (2,104) | (2,054)
Net carrying amount | 148 | 198
Trademark [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 80 | 80
Accumulated amortization | (80) | (80)
Net carrying amount | $ 0 | $ 0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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