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Marketable Securities | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 3. Marketable Securities The amortized cost and estimated fair value of marketable securities, by remaining contractual maturity, are as follows:
|  | September 30, 2024 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Holding Gains |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |
Maturing after one year through five years |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  |  | 9,943 |  |  |  | 68 |  |  |  | — |  |  |  | 10,011 |
Total |  | $ | 9,943 |  |  | $ | 68 |  |  | $ | — |  |  | $ | 10,011 |
|  | December 31, 2023 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Holding Gains |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |
Maturing in one year or less |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Bill |  | $ | 8,806 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 8,812 |
U.S. Treasuries |  |  | 97,086 |  |  |  | 12 |  |  |  | (95 | ) |  |  | 97,003 |
Total |  | $ | 105,892 |  |  | $ | 18 |  |  | $ | (95 | ) |  | $ | 105,815 |
The Company did not have any individual securities in an unrealized loss position as of September 30, 2024. The following table summarizes the fair value and gross unrealized losses aggregated by category and the length of time that individual securities were in an unrealized loss position as of December 31, 2023:
|  | December 31, 2023 |
|  | Less than twelve months |  |  | Greater than twelve months |  |  | Total |
(in thousands) |  | Fair value |  |  | Unrealized loss |  |  | Fair value |  |  | Unrealized loss |  |  | Fair value |  |  | Unrealized loss |
U.S. Treasuries |  | $ | — |  |  | $ | — |  |  | $ | 53,447 |  |  | $ | (95 | ) |  | $ | 53,447 |  |  | $ | (95 | )
Total |  | $ | — |  |  | $ | — |  |  | $ | 53,447 |  |  | $ | (95 | ) |  | $ | 53,447 |  |  | $ | (95 | )
The Co mpany did no t record any impairments to marketable securities or reserves for credit losses related to its marketable debt securities during the periods presented.

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