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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | $ 455,554 | $ 412,949
Unrealized Gains (Losses) | (19) | (328)
Fair Value | 455,535 | 412,621
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 745 | 745
Fair Value | 742 | 743
Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 451,508 | 232,018
Short-term Investments and Marketable Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 4,027 | 180,603
Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 451,508 | 232,018
Unrealized Gains (Losses) | 0 | 0
Fair Value | 451,508 | 232,018
Level 1 | Cash and Cash Equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 451,508 | 232,018
Level 1 | Short-term Investments and Marketable Securities | 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 | 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 | $ 0 | $ 990
Unrealized Gains (Losses) | 0 | 6
Fair Value | 0 | 996
Level 2 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 0 | 1,281
Unrealized Gains (Losses) | 0 | 6
Fair Value | 0 | 1,287
Level 2 | Short-term bond mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 0 | 100,242
Unrealized Gains (Losses) | 0 | (99)
Fair Value | 0 | 100,143
Level 2 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost Basis | 4,046 | 78,418
Unrealized Gains (Losses) | (19) | (241)
Fair Value | 4,027 | 78,177
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 | 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 | 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 | 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 and Marketable Securities | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 996
Level 2 | Short-term Investments and Marketable Securities | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 1,287
Level 2 | Short-term Investments and Marketable Securities | Short-term bond mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 100,143
Level 2 | Short-term Investments and Marketable Securities | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 4,027 | $ 78,177

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