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Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | $ 16,152 | $ 83,706
Corporate Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 6,042 | 38,244
U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 4,814 | 19,556
U.S. agency and government sponsored securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 1,798 | 9,560
U.S. states and municipalities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 3,498 | $ 10,906
Level 1 |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 10,856 |
Level 1 | Corporate Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 6,042 |
Level 1 | U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 4,814 |
Level 1 | U.S. agency and government sponsored securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 0 |
Level 1 | U.S. states and municipalities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 0 |
Level 2 |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 5,296 |
Level 2 | Corporate Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 0 |
Level 2 | U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 0 |
Level 2 | U.S. agency and government sponsored securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | 1,798 |
Level 2 | U.S. states and municipalities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Marketable investments | $ 3,498 |

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