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Share-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based employee compensation expense $ 374,000 $ 234,000 $ 674,000 $ 424,000
Cost of product revenue        
Share-based employee compensation expense 10,000 4,000 20,000 8,000
Research and development expense        
Share-based employee compensation expense 102,000 68,000 185,000 116,000
Sales, marketing, general and administrative expense        
Share-based employee compensation expense $ 262,000 $ 162,000 $ 469,000 $ 300,000