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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