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Stock-Based Compensation (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | $ 7,674 | $ 5,890 | $ 4,473
Cost of products [Member] |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 207 | 164 | 176
Cost of service [Member] |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 278 | 230 | 218
Research and development [Member] |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 1,478 | 1,220 | 984
Selling [Member] |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 1,894 | 1,791 | 1,366
General and administrative [Member] |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 2,919 | 2,485 | 1,729
Restructuring [Member] |  |  |
Stock-based compensation expense for all share-based payment awards |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | $ 898 | $ 0 | $ 0

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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