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Fair Value (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Assets | $ 168,364 | $ 218,134
Money market funds |  |
Assets: |  |
Assets | 43,130 | 38,360
Commercial paper |  |
Assets: |  |
Assets | 18,817 | 22,978
Government and agency obligations |  |
Assets: |  |
Assets | 32,446 | 32,690
Corporate bonds |  |
Assets: |  |
Assets | 70,944 | 95,845
Asset-backed securities |  |
Assets: |  |
Assets | 3,027 | 28,261
Quoted Prices in ‎Active Markets for ‎Identical Assets ‎(Level 1) |  |
Assets: |  |
Assets | 32,446 | 32,690
Quoted Prices in ‎Active Markets for ‎Identical Assets ‎(Level 1) | Money market funds |  |
Assets: |  |
Assets | 0 | 0
Quoted Prices in ‎Active Markets for ‎Identical Assets ‎(Level 1) | Commercial paper |  |
Assets: |  |
Assets | 0 | 0
Quoted Prices in ‎Active Markets for ‎Identical Assets ‎(Level 1) | Government and agency obligations |  |
Assets: |  |
Assets | 32,446 | 32,690
Quoted Prices in ‎Active Markets for ‎Identical Assets ‎(Level 1) | Corporate bonds |  |
Assets: |  |
Assets | 0 | 0
Quoted Prices in ‎Active Markets for ‎Identical Assets ‎(Level 1) | Asset-backed securities |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Observable Inputs ‎(Level 2) |  |
Assets: |  |
Assets | 135,918 | 185,444
Significant Other ‎Observable Inputs ‎(Level 2) | Money market funds |  |
Assets: |  |
Assets | 43,130 | 38,360
Significant Other ‎Observable Inputs ‎(Level 2) | Commercial paper |  |
Assets: |  |
Assets | 18,817 | 22,978
Significant Other ‎Observable Inputs ‎(Level 2) | Government and agency obligations |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Observable Inputs ‎(Level 2) | Corporate bonds |  |
Assets: |  |
Assets | 70,944 | 95,845
Significant Other ‎Observable Inputs ‎(Level 2) | Asset-backed securities |  |
Assets: |  |
Assets | 3,027 | 28,261
Significant Other ‎Unobservable ‎Inputs (Level 3) |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Unobservable ‎Inputs (Level 3) | Money market funds |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Unobservable ‎Inputs (Level 3) | Commercial paper |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Unobservable ‎Inputs (Level 3) | Government and agency obligations |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Unobservable ‎Inputs (Level 3) | Corporate bonds |  |
Assets: |  |
Assets | 0 | 0
Significant Other ‎Unobservable ‎Inputs (Level 3) | Asset-backed securities |  |
Assets: |  |
Assets | $ 0 | $ 0

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