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Marketable Debt Securities | 3 Months Ended
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Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Marketable Debt Securities | 4. Marketable Securities The following tables show the Company's available-for-sale securities adjusted cost, net unrealized gains and losses and fair value by significant investment category (in thousands):
|  | March 31, 2025 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Marketable Securities: |  |  |  |  |  |  |  |  |  |  |  |
Treasury securities |  | $ | 122,315 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 122,306 |
Total |  | $ | 122,315 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 122,306 |
|  | December 31, 2024 |
|  | Adjusted Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Marketable Securities: |  |  |  |  |  |  |  |  |  |  |  |
Treasury securities |  | $ | 119,792 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 119,808 |
Total |  | $ | 119,792 |  |  | $ | 16 |  |  | $ | — |  |  | $ | 119,808 |

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