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Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-based employee compensation expense	$ 385,000	$ 378,000
Cost of contract revenue
Stock-based employee compensation expense	4,000	6,000
Cost of product revenue
Stock-based employee compensation expense	1,000	20,000
Research and development expense
Stock-based employee compensation expense	160,000	137,000
Sales, marketing, general and administrative expense
Stock-based employee compensation expense	$ 220,000	$ 215,000

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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