| Schedule of restricted marketable securities |
Restricted marketable securities consisted of the following as of March 31, 2025 and December 31, 2024 (in thousands): | | | | | | | | | | | | | | | | | March 31,
2025 | | December 31,
2024 | | U.S. debt | | $ | 113,048 | | | $ | 109,155 | | | Foreign government obligations | | 50,592 | | | 49,024 | | | Supranational debt | | 28,118 | | | 22,809 | | | U.S. government obligations | | 18,797 | | | 18,148 | | | Total restricted marketable securities | | $ | 210,555 | | | $ | 199,136 | |
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| Schedule of restricted marketable securities, including unrealized gain or loss |
The following tables summarize the unrealized gains and losses related to our restricted marketable securities, by major security type, as of March 31, 2025 and December 31, 2024 (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of March 31, 2025 | | | Amortized
Cost | | Unrealized
Gains | | Unrealized
Losses | | Fair
Value | | U.S. debt | | $ | 144,193 | | | $ | — | | | $ | 31,145 | | | $ | 113,048 | | | Foreign government obligations | | 63,972 | | | — | | | 13,380 | | | 50,592 | | | Supranational debt | | 30,287 | | | 14 | | | 2,183 | | | 28,118 | | | U.S. government obligations | | 24,344 | | | — | | | 5,547 | | | 18,797 | | | Total | | $ | 262,796 | | | $ | 14 | | | $ | 52,255 | | | $ | 210,555 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of December 31, 2024 | | | Amortized
Cost | | Unrealized
Gains | | Unrealized
Losses | | Fair
Value | | U.S. debt | | $ | 144,652 | | | $ | — | | | $ | 35,497 | | | $ | 109,155 | | | Foreign government obligations | | 62,595 | | | — | | | 13,571 | | | 49,024 | | | Supranational debt | | 25,351 | | | — | | | 2,542 | | | 22,809 | | | U.S. government obligations | | 24,368 | | | — | | | 6,220 | | | 18,148 | | | Total | | $ | 256,966 | | | $ | — | | | $ | 57,830 | | | $ | 199,136 | |
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