Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock-based employee compensation expense	$ 515,000	$ 876,000	$ 996,000	$ 1,730,000
Cost of contract revenue
Stock-based employee compensation expense	11,000	15,000	15,000	25,000
Cost of product revenue
Stock-based employee compensation expense	0	20,000	1,000	40,000
Research and development expense
Stock-based employee compensation expense	172,000	389,000	260,000	613,000
Sales, marketing, general and administrative expense
Stock-based employee compensation expense	$ 332,000	$ 452,000	$ 720,000	$ 1,052,000