Summary of Significant Accounting Policies (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based employee compensation expense	$ 1,007,000	$ 713,000	$ 1,606,000
Cost of product revenue
Share-based employee compensation expense	19,000	0	1,000
Cost of contract revenue
Share-based employee compensation expense	0	28,000	19,000
Research and development expense
Share-based employee compensation expense	282,000	34,000	466,000
Sales, marketing, general and administrative expense
Share-based employee compensation expense	$ 706,000	$ 651,000	$ 1,120,000