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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Investments |  |  |
Investments - Available-for-sale | $ 94,485 |  | $ 98,031
Available-for-sale investments |  |  |
Adjusted Cost | 94,634 |  |
Gross Unrealized Gains | 159 |  |
Gross Unrealized (Losses) | (308) |  |
Estimated Fair Value | 94,485 |  |
Net unrealized gains and losses on available-for-sale debt securities | 56 | $ (119) |
Corporate bonds |  |  |
Available-for-sale investments |  |  |
Adjusted Cost | 79,633 |  |
Gross Unrealized Gains | 155 |  |
Gross Unrealized (Losses) | (295) |  |
Estimated Fair Value | 79,493 |  |
Agency bonds |  |  |
Available-for-sale investments |  |  |
Adjusted Cost | 15,001 |  |
Gross Unrealized Gains | 4 |  |
Gross Unrealized (Losses) | (13) |  |
Estimated Fair Value | $ 14,992 |  |

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