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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based employee compensation expense $ 234,000 $ 201,000 $ 424,000 $ 506,000
Cost of product revenue        
Share-based employee compensation expense 4,000 0 8,000 0
Research and development expense        
Share-based employee compensation expense 68,000 (127,000) 116,000 (13,000)
Sales, marketing, general and administrative expense        
Share-based employee compensation expense $ 162,000 $ 328,000 $ 300,000 $ 519,000