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Goodwill and Intangible Assets - Summary of Components of Gross and Net Intangible Asset (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 28, 2014 | Dec. 28, 2013
Schedule of Intangible Assets |  |  |
Gross Carrying Amount | $ 960 | $ 960 |
Accumulated Amortization | 668 | 632 |
Net Carrying Amount | 292 | 328 | [1]
Patents |  |  |
Schedule of Intangible Assets |  |  |
Gross Carrying Amount | 720 | 720 |
Accumulated Amortization | 600 | 572 |
Net Carrying Amount | 120 | 148 |
Customer Relations |  |  |
Schedule of Intangible Assets |  |  |
Gross Carrying Amount | 240 | 240 |
Accumulated Amortization | 68 | 60 |
Net Carrying Amount | $ 172 | $ 180 |
Amortization Life | 11 years |  |
[1] | Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2013.

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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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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