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3. Restricted Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Debt Securities, Available-for-Sale, Restricted [Abstract] |
Schedule of Restricted Marketable Securities | Restricted marketable securities consisted of the following as of September 30, 2024 and December 31, 2023 (in thousands):
|  | September 30, 2024 |  | December 31, 2023
Foreign government obligations |  | $ | 52,368 |  |  | $ | 51,229 |
Supranational debt |  | 23,350 |  |  | 15,339 |
U.S. debt |  | 116,157 |  |  | 113,326 |
U.S. government obligations |  | 19,255 |  |  | 18,416 |
Total restricted marketable securities |  | $ | 211,130 |  |  | $ | 198,310 |
Restricted Available-for-sale Marketable Securities | The following tables summarize the unrealized gains and losses related to our restricted marketable securities, by major security type, as of September 30, 2024 and December 31, 2023 (in thousands):
|  | As of September 30, 2024
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Allowance for Credit Losses |  | Fair Value
Foreign government obligations |  | $ | 65,336 |  |  | $ | — |  |  | $ | 12,968 |  |  | $ | — |  |  | $ | 52,368 |
Supranational debt |  | 25,405 |  |  | 3 |  |  | 2,058 |  |  | — |  |  | 23,350 |
U.S. debt |  | 145,113 |  |  | — |  |  | 28,956 |  |  | — |  |  | 116,157 |
U.S. government obligations |  | 24,391 |  |  | — |  |  | 5,136 |  |  | — |  |  | 19,255 |
Total |  | $ | 260,245 |  |  | $ | 3 |  |  | $ | 49,118 |  |  | $ | — |  |  | $ | 211,130 |
|  | As of December 31, 2023
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Allowance for Credit Losses |  | Fair Value
Foreign government obligations |  | $ | 65,202 |  |  | $ | — |  |  | $ | 13,963 |  |  | $ | 10 |  |  | $ | 51,229 |
Supranational debt |  | 17,688 |  |  | — |  |  | 2,349 |  |  | — |  |  | 15,339 |
U.S. debt |  | 146,484 |  |  | — |  |  | 33,129 |  |  | 29 |  |  | 113,326 |
U.S. government obligations |  | 24,460 |  |  | — |  |  | 6,039 |  |  | 5 |  |  | 18,416 |
Total |  | $ | 253,834 |  |  | $ | — |  |  | $ | 55,480 |  |  | $ | 44 |  |  | $ | 198,310 |

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