The cost and fair value of marketable securities are as follows: | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2024 | | (in thousands) | Amortized Cost | | Gross Unrealized
Gains | | Gross Unrealized
Losses | | Fair Value | | U.S. Treasury bills | $ | 55,009 | | | $ | 190 | | | $ | — | | | $ | 55,199 | | | Municipal bonds | 9,631 | | | 38 | | | (351) | | | 9,318 | | | Corporate/government bonds | 479 | | | 33 | | | — | | | 512 | | | Other bonds | 478 | | | 34 | | | — | | | 512 | | | $ | 65,597 | | | $ | 295 | | | $ | (351) | | | $ | 65,541 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2023 | | (in thousands) | Amortized Cost | | Gross Unrealized
Gains | | Gross Unrealized
Losses | | Fair Value | | U.S. Treasury bills | $ | 60,801 | | | $ | 131 | | | $ | — | | | $ | 60,932 | | | Municipal bonds | 9,543 | | | 148 | | | (404) | | | 9,287 | | | Corporate/government bonds | 477 | | | 29 | | | — | | | 506 | | | Other bonds | 478 | | | 27 | | | — | | | 505 | | | $ | 71,299 | | | $ | 335 | | | $ | (404) | | | $ | 71,230 | |
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