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Stockholders' Equity And Stock-Based Compensation (Summary Of Non-Cash Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense $ 4,334 $ 3,457 $ 3,761
Research And Development [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 1,751 1,198 1,624
General And Administrative [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 2,583 2,259 2,137
Employee Stock Options [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 3,492 3,457 3,761
Employee Stock Options [Member] | Research And Development [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 1,313 1,198 1,624
Employee Stock Options [Member] | General And Administrative [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 2,179 $ 2,259 $ 2,137
Performance Awards [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 842    
Performance Awards [Member] | Research And Development [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense 438    
Performance Awards [Member] | General And Administrative [Member]      
Stock-Based Compensation [Line Items]      
Share-Based Compensation Expense $ 404