| Schedule of Available for Sale Securities |
The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s marketable securities by major security type at each balance sheet date are summarized in the tables below (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2026 | | Amortized Cost | | Unrealized Holding Gains | | Unrealized Holding Losses | | Aggregate Fair Value | Short-term marketable securities: | | | | | | | | U.S. government treasuries | $ | 323,797 | | | $ | — | | | $ | (826) | | | $ | 322,971 | | | | | | | | | | Corporate debt securities | 90,690 | | | — | | | (335) | | | 90,355 | | | | | | | | | | Total short-term marketable securities | 414,487 | | | — | | | (1,161) | | | 413,326 | | Long-term marketable securities: | | | | | | | | U.S. government treasuries | 339,842 | | | — | | | (3,031) | | | 336,811 | | | | | | | | | | Corporate debt securities | 156,378 | | | — | | | (1,813) | | | 154,565 | | Total long-term marketable securities | 496,220 | | | — | | | (4,844) | | | 491,376 | | Total | $ | 910,707 | | | $ | — | | | $ | (6,005) | | | $ | 904,702 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Amortized Cost | | Unrealized Holding Gains | | Unrealized Holding Losses | | Aggregate Fair Value | Short-term marketable securities: | | | | | | | | U.S. government treasuries | $ | 599,200 | | | $ | 893 | | | $ | (9) | | | $ | 600,084 | | | | | | | | | | Corporate debt securities | 62,407 | | | 71 | | | (9) | | | 62,469 | | | | | | | | | | Total short-term marketable securities | 661,607 | | | 964 | | | (18) | | | 662,553 | | Long-term marketable securities: | | | | | | | | U.S. government treasuries | 58,524 | | | 21 | | | — | | | 58,545 | | | | | | | | | | Corporate debt securities | 39,710 | | | 69 | | | (2) | | | 39,777 | | Total long-term marketable securities | 98,234 | | | 90 | | | (2) | | | 98,322 | | Total | $ | 759,841 | | | $ | 1,054 | | | $ | (20) | | | $ | 760,875 | |
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