Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based employee compensation expense	$ 856,000	$ 900,000	$ 1,697,000	$ 2,609,000
Cost of contract revenue
Stock-based employee compensation expense	15,000	56,000	25,000	97,000
Cost of product revenue
Stock-based employee compensation expense	20,000	60,000	40,000	100,000
Research and development expense
Stock-based employee compensation expense	389,000	337,000	613,000	1,075,000
Sales, marketing, general and administrative expense
Stock-based employee compensation expense	$ 432,000	$ 447,000	$ 1,019,000	$ 1,337,000