Summary of Significant Accounting Policies (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based employee compensation expense	$ 1,223	$ 1,007	$ 713
Cost of product revenue
Share-based employee compensation expense	37	19	0
Cost of contract revenue
Share-based employee compensation expense	0	0	28
Research and development expense
Share-based employee compensation expense	350	282	34
Sales, marketing, general and administrative expense
Share-based employee compensation expense	$ 836	$ 706	$ 651