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Equity and Stock Based Compensation Plans (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Stock-based compensation expense for all share-based payment awards
Total stock-based compensation expense	$ 1,634	$ 1,457
Cost of products [Member]
Stock-based compensation expense for all share-based payment awards
Total stock-based compensation expense	61	45
Cost of service [Member]
Stock-based compensation expense for all share-based payment awards
Total stock-based compensation expense	84	59
Research and development [Member]
Stock-based compensation expense for all share-based payment awards
Total stock-based compensation expense	340	317
Selling [Member]
Stock-based compensation expense for all share-based payment awards
Total stock-based compensation expense	427	440
General and administrative [Member]
Stock-based compensation expense for all share-based payment awards
Total stock-based compensation expense	$ 722	$ 596

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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

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