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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-For-Sale Securities |  |
Amortized Cost | $ 27,316 | $ 29,444
Gross Unrealized Gain | 4 | 434
Gross Unrealized (Losses) | (527) | 0
Estimated Fair Value | 26,793 | 29,878
Tax-exempt municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 18,598 | 18,546
Gross Unrealized Gain | 4 | 271
Gross Unrealized (Losses) | (365) | 0
Estimated Fair Value | 18,237 | 18,817
Corporate debt securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 8,718 | 10,898
Gross Unrealized Gain | 0 | 163
Gross Unrealized (Losses) | (162) | 0
Estimated Fair Value | $ 8,556 | $ 11,061

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