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Financial Instruments (Summary Of Financial Instruments Measured At Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets $ 27,842 $ 26,770  
Contingent consideration (46,420) (63,890)  
Total liabilities (46,420) (63,890)  
Money market funds      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 23,958 22,802  
Certificates of deposit      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 3,884 3,968  
Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets 27,842 26,770  
Contingent consideration 0 0  
Total liabilities 0   $ 0
Level 1 | Money market funds      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 23,958 22,802  
Level 1 | Certificates of deposit      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 3,884 3,968  
Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets 0 0  
Contingent consideration 0 0  
Total liabilities 0   0
Level 2 | Money market funds      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 0 0  
Level 2 | Certificates of deposit      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 0 0  
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets 0 0  
Contingent consideration (46,420) (63,890)  
Total liabilities (46,420)   $ (63,890)
Level 3 | Money market funds      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: 0 0  
Level 3 | Certificates of deposit      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents: $ 0 $ 0