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Investments | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Investments | The following table represents the Company’s available-for-sale investments by major security type (amounts in thousands):
| December 31, 2023
| Amortized Cost |  | Gross Unrealized Gain |  | Total Fair Value
Investments: |  |  |  |  |
U.S. government securities | $ | 4,998 |  |  | $ | 1 |  |  | $ | 4,999 |
Cash Equivalents: |  |  |  |  |
U.S. government securities | 39,657 |  |  | 3 |  |  | 39,660 |
Total level 1 debt securities | $ | 44,655 |  |  | $ | 4 |  |  | $ | 44,659 |
| December 31, 2022
| Amortized Cost |  | Gross Unrealized Loss |  | Total Fair Value
Investments: |  |  |  |  |
U.S. government securities | $ | 114,778 |  |  | $ | (877) |  |  | $ | 113,901 |
Cash Equivalents: |  |  |  |  |
U.S. government securities | — |  |  | — |  |  | — |
Total level 1 debt securities | $ | 114,778 |  |  | $ | (877) |  |  | $ | 113,901 |
The Company’s investment instruments and cash and cash equivalents are classified using Level 1 inputs within the fair value hierarchy and are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Debt securities have an average maturity of 0.15 years as of December 31, 2023.

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