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Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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Investments, Debt and Equity Securities [Abstract] |
Unrealized Losses, Less than 12 months | $ (531)
Unrealized Losses, 12 months or more | 0
Unrealized Losses, Total | (531)
Fair value, Less than 12 months | 25,814
Fair value, 12 months or more | 0
Fair value, Total | 25,814
Unrealized Gains, Less than 12 months | 0
Unrealized Gains, 12 months or more | 53
Unrealized Gains, Total | 53
Fair value, Less than 12 months | 0
Fair value, 12 months or more | 5,974
Fair value, Total | $ 5,974

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