Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stock-based employee compensation expense	$ 96,000	$ 481,000	$ 481,000	$ 854,000
Cost of contract revenue
Stock-based employee compensation expense	0	4,000	4,000	10,000
Cost of product revenue
Stock-based employee compensation expense	0	0	1,000	20,000
Research and development expense
Stock-based employee compensation expense	(72,000)	87,000	88,000	224,000
Sales, marketing, general and administrative expense
Stock-based employee compensation expense	$ 168,000	$ 390,000	$ 388,000	$ 600,000