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Stockholders' Equity And Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total stock-based compensation expense $ 11,287 $ 12,338 $ 10,926
Sales, general and administrative [Member]      
Total stock-based compensation expense 7,466 9,004 9,136
Research and development [Member]      
Total stock-based compensation expense $ 3,821 $ 3,334 $ 1,790