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Stock-Based Compensation (Details 2) (USD $)	3 Months Ended
Stock-Based Compensation (Details 2) (USD $)	Mar. 30, 2013	Mar. 31, 2012
Stock-Based Compensation
Total stock-based compensation (in dollars)	$ 142,000	$ 180,000
Issuance of common stock for services provided (in shares)	38,000
Fair value of common stock for services provided	39,000
Manufacturing
Stock-Based Compensation
Total stock-based compensation (in dollars)		15,000
Research and development
Stock-Based Compensation
Total stock-based compensation (in dollars)	49,000	55,000
Sales, general and administrative
Stock-Based Compensation
Total stock-based compensation (in dollars)	$ 93,000	$ 110,000

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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