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Investments | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Investments | (5) Investments Our investments, which are all classified as available-for-sale, consisted of the following:
| As of December 31, 2023
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Description: |  |  |  |  |  |  |
U.S government agencies | $ | 222,820 |  |  | $ | 467 |  |  | $ | (65) |  |  | $ | 223,222 |
Agency bonds | 2,500 |  |  | — |  |  | (7) |  |  | 2,493 |
Total | $ | 225,320 |  |  | $ | 467 |  |  | $ | (72) |  |  | $ | 225,715 |
| As of December 31, 2022
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Description: |  |  |  |  |  |  |
U.S government agencies | $ | 66,234 |  |  | $ | 4 |  |  | $ | (545) |  |  | $ | 65,693 |
Corporate bonds | 14,351 |  |  | — |  |  | (230) |  |  | 14,121 |
Commercial paper | 7,944 |  |  | — |  |  | — |  |  | 7,944 |
Agency bonds | 6,231 |  |  | — |  |  | (71) |  |  | 6,160 |
Total | $ | 94,760 |  |  | $ | 4 |  |  | $ | (846) |  |  | $ | 93,918 |
As of December 31, 2023, our available-for-sale investments had maturities ranging from 1 to 18 months. As of December 31, 2022, our available-for-sale investments had maturities ranging from 2 to 19 months. For all of our investments for which the amortized cost basis was greater than the fair value at December 31, 2023 and December 31, 2022, we have concluded that there is no plan to sell the security nor is it more likely than not that we would be required to sell the security before its anticipated maturity. In making the determination as to whether the unrealized loss is other-than-temporary, we considered the length of time and extent the investment has been in an unrealized loss position, the financial condition and near-term prospects of the issuers, the issuers’ credit rating and the time to maturity.

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