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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Sep. 28, 2013 | Dec. 29, 2012
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Summary of Finite-lived intangible assets |  |
Adjusted cost | $ 31,765 | $ 31,497
Accumulated amortization | (23,206) | (20,517)
Net carrying amount | 8,559 | 10,980
Developed technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 17,948 | 17,700
Accumulated amortization | (10,313) | (8,277)
Net carrying amount | 7,635 | 9,423
Customer relationships [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 9,558 | 9,538
Accumulated amortization | (9,166) | (8,643)
Net carrying amount | 392 | 895
Brand names [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 1,927 | 1,927
Accumulated amortization | (1,675) | (1,599)
Net carrying amount | 252 | 328
Patented technology [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 2,252 | 2,252
Accumulated amortization | (1,972) | (1,922)
Net carrying amount | 280 | 330
Trademark [Member] |  |
Summary of Finite-lived intangible assets |  |
Adjusted cost | 80 | 80
Accumulated amortization | (80) | (76)
Net carrying amount | $ 0 | $ 4

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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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- Definition Amount after 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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