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Financial Instruments | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Financial Instruments | Financial Instruments Marketable securities and long-term investments classified as available-for-sale on September 30, 2024 and December 31, 2023 consisted of the following (in thousands):
| September 30, 2024
| Maturity |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
U.S. Treasury bills | Less than one year |  | $ | 113,496 |  |  | $ | 194 |  |  | $ | — |  |  | $ | 113,690 |
U.S. Treasury bills | Between one and two years |  | 2,559 |  |  | — |  |  | (2) |  |  | 2,557 |
Total |  |  | $ | 116,055 |  |  | $ | 194 |  |  | $ | (2) |  |  | $ | 116,247 |
| December 31, 2023
| Maturity |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
U.S. Treasury bills | Less than one year |  | $ | 141,075 |  |  | $ | 86 |  |  | $ | — |  |  | $ | 141,161 |
U.S. Treasury bills | Between one and two years |  | 23,134 |  |  | 27 |  |  | — |  |  | 23,161 |
Total |  |  | $ | 164,209 |  |  | $ | 113 |  |  | $ | — |  |  | $ | 164,322 |
As of September 30, 2024 and December 31, 2023, marketable securities that had contractual maturities less than one year are classified as current because management considers these marketable securities to be available for current operations. As of September 30, 2024 and December 31, 2023, marketable securities that had contractual maturities between one and two years are classified as long-term because management considers these marketable securities to be available for operations beyond one year. The Company does not intend to sell its marketable securities and it is not likely that the Company will be required to sell these securities before recovery of their amortized cost basis. There were $113.7 million of marketable securities and $2.6 million of long-term investments maturing in less than two years classified as available-for-sale as of September 30, 2024. There were $141.2 million of marketable securities and $23.2 million of long-term investments maturing in less than two years classified as available-for-sale as of December 31, 2023.

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