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Marketable Securities - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-For-Sale Securities |  |
Amortized Cost | $ 22,992 | $ 29,444
Gross Unrealized Gain | 2 | 434
Gross Unrealized (Losses) | (715) | 0
Estimated Fair Value | 22,279 | 29,878
Tax-exempt municipal securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 15,852 | 18,546
Gross Unrealized Gain | 2 | 271
Gross Unrealized (Losses) | (507) | 0
Estimated Fair Value | 15,347 | 18,817
Corporate debt securities |  |
Available-For-Sale Securities |  |
Amortized Cost | 7,140 | 10,898
Gross Unrealized Gain | 0 | 163
Gross Unrealized (Losses) | (208) | 0
Estimated Fair Value | $ 6,932 | $ 11,061

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