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Marketable Securities | 12 Months Ended
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Dec. 31, 2024
Marketable Securities [Abstract] |
Marketable Securities | 4. Marketable Securities Available-for-sale marketable securities were as follows (in thousands):
| December 31, 2024 |
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Government agency |  | 519,125 |  |  |  | 1,007 |  |  |  | (159 | ) |  |  | 519,973 |
Total | $ | 519,125 |  |  | $ | 1,007 |  |  | $ | (159 | ) |  | $ | 519,973 |
| December 31, 2023 |
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Commercial paper | $ | 26,752 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 26,737 |
Corporate debt |  | 5,988 |  |  |  | — |  |  |  | (7 | ) |  |  | 5,982 |
Government agency |  | 301,315 |  |  |  | 584 |  |  |  | (16 | ) |  |  | 301,884 |
Total | $ | 334,056 |  |  | $ | 584 |  |  | $ | (38 | ) |  | $ | 334,602 |
The fair value of available-for-sale marketable securities by contractual maturity as of December 31, 2024 and 2023 were as follows (in thousands):
| December 31, |
| 2024 |  |  | 2023 |
Due in 1 year or less | $ | 481,696 |  |  | $ | 307,434 |
Due in 1 - 2 years |  | 38,277 |  |  |  | 27,168 |
Total | $ | 519,973 |  |  | $ | 334,602 |
The Company had 9 securities in an unrealized loss position with an aggregate related fair value of $108.4 million as of December 31, 2024. The Company had 8 securities in an unrealized loss position with an aggregate related fair value of $61.5 million as of December 31, 2023. All securities in an unrealized loss position as of December 31, 2024 and 2023 had been in a loss position for less than twelve months. Unrealized losses on available-for-sale marketable securities as of December 31, 2024 and 2023 were not significant and were primarily due to changes in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, no allowance for credit losses related to the Company’s available-for-sale marketable securities was recorded for the years ended December 31, 2024 and 2023. The Company does not intend to sell these securities and it is unlikely that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. As of December 31, 2024 and 2023, the Company recognized $2.5 million and $1.4 million, respectively, of accrued interest receivable from available-for-sale securities within prepaid expenses and other current assets on the consolidated balance sheets.

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