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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis $ 412,949 $ 418,621
Unrealized Gains (Losses) (328) 0
Fair Value 412,621 418,621
Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 745  
Fair Value 743  
Cash and Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 232,018 417,486
Short-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 180,603 1,135
Level 1 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 232,018 417,486
Unrealized Gains (Losses) 0 0
Fair Value 232,018 417,486
Level 1 | Cash and Cash Equivalents | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 232,018 417,486
Level 1 | Short-term Investments | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted average maturity 1 year 3 months 18 days  
Level 2 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis $ 990  
Unrealized Gains (Losses) 6  
Fair Value 996  
Level 2 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 1,281  
Unrealized Gains (Losses) 6  
Fair Value 1,287  
Level 2 | Short-term bond mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 100,242  
Unrealized Gains (Losses) (99)  
Fair Value 100,143  
Level 2 | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 78,418 1,135
Unrealized Gains (Losses) (241) 0
Fair Value 78,177 1,135
Level 2 | Cash and Cash Equivalents | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0  
Level 2 | Cash and Cash Equivalents | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0  
Level 2 | Cash and Cash Equivalents | Short-term bond mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0  
Level 2 | Cash and Cash Equivalents | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Level 2 | Short-term Investments | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 996  
Level 2 | Short-term Investments | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,287  
Level 2 | Short-term Investments | Short-term bond mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 100,143  
Level 2 | Short-term Investments | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 78,177 $ 1,135