| Schedule of marketable debt securities, classified as available-for-sale |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Amortized | | Gross Unrealized | | Gross Unrealized | | Fair | | | Cost | | Gains | | Losses | | Value | | | | (In thousands) | September 30, 2026 | | | | | | | | | | | | | Marketable securities | | | | | | | | | | | | | U.S. government and municipal obligations | | | | | | | | | | | | | Maturing in one year or less | | $ | 158,525 | | $ | 4 | | $ | (556) | | $ | 157,973 | Maturing after one year through three years | | | 95,494 | | | — | | | (1,041) | | | 94,453 | Total U.S. government and municipal obligations | | $ | 254,019 | | $ | 4 | | $ | (1,597) | | $ | 252,426 | Corporate debt securities | | | | | | | | | | | | | Maturing in one year or less | | $ | 292,883 | | $ | 3 | | $ | (811) | | $ | 292,075 | Maturing after one year through three years | | | 79,390 | | | — | | | (524) | | | 78,866 | Total corporate debt securities | | $ | 372,273 | | $ | 3 | | $ | (1,335) | | $ | 370,941 | Total marketable securities | | $ | 626,292 | | $ | 7 | | $ | (2,932) | | $ | 623,367 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Amortized | | Gross Unrealized | | Gross Unrealized | | Fair | | | Cost | | Gains | | Losses | | Value | | | | (In thousands) | December 31, 2025 | | | | | | | | | | | | | Marketable securities | | | | | | | | | | | | | U.S. government and municipal obligations | | | | | | | | | | | | | Maturing in one year or less | | $ | 151,270 | | $ | 479 | | $ | — | | $ | 151,749 | Maturing after one year through three years | | | 42,358 | | | 127 | | | — | | | 42,485 | Total U.S. government and municipal obligations | | $ | 193,628 | | $ | 606 | | $ | — | | $ | 194,234 | Corporate debt securities | | | | | | | | | | | | | Maturing in one year or less | | $ | 257,064 | | $ | 373 | | $ | — | | $ | 257,437 | Maturing after one year through three years | | | 37,980 | | | 55 | | | (4) | | | 38,031 | Total corporate debt securities | | $ | 295,044 | | $ | 428 | | $ | (4) | | $ | 295,468 | Total marketable securities | | $ | 488,672 | | $ | 1,034 | | $ | (4) | | $ | 489,702 |
|