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Stock-Based Compensation (Schedule of Allocation of Recognized Period Cost) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total costs and expenses	$ 434,000	$ 436,000	$ 818,000	$ 879,000
Cost of Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total costs and expenses	39,000	35,000	71,000	70,000
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total costs and expenses	99,000	119,000	192,000	240,000
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total costs and expenses	$ 296,000	$ 282,000	$ 555,000	$ 569,000

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.

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