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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Marketable Securities |
Schedule of marketable debt securities, classified as available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 153,745 | ​ | $ | 355 | ​ | $ | (2) | ​ | $ | 154,098
Maturing after one year through three years | ​ | ​ | 54,675 | ​ | ​ | 264 | ​ | ​ | — | ​ | ​ | 54,939
Total U.S. government and municipal obligations | ​ | $ | 208,420 | ​ | $ | 619 | ​ | $ | (2) | ​ | $ | 209,037
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 305,427 | ​ | $ | 470 | ​ | $ | — | ​ | $ | 305,897
Maturing after one year through three years | ​ | ​ | 32,171 | ​ | ​ | 82 | ​ | ​ | (1) | ​ | ​ | 32,252
Total corporate debt securities | ​ | $ | 337,598 | ​ | $ | 552 | ​ | $ | (1) | ​ | $ | 338,149
Total marketable securities | ​ | $ | 546,018 | ​ | $ | 1,171 | ​ | $ | (3) | ​ | $ | 547,186
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 185,388 | ​ | $ | 467 | ​ | $ | — | ​ | $ | 185,855
Maturing after one year through three years | ​ | ​ | 102,331 | ​ | ​ | 316 | ​ | ​ | (144) | ​ | ​ | 102,503
Total U.S. government and municipal obligations | ​ | $ | 287,719 | ​ | $ | 783 | ​ | $ | (144) | ​ | $ | 288,358
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 336,350 | ​ | $ | 350 | ​ | $ | (54) | ​ | $ | 336,646
Maturing after one year through three years | ​ | ​ | 72,139 | ​ | ​ | 36 | ​ | ​ | (254) | ​ | ​ | 71,921
Total corporate debt securities | ​ | $ | 408,489 | ​ | $ | 386 | ​ | $ | (308) | ​ | $ | 408,567
Total marketable securities | ​ | $ | 696,208 | ​ | $ | 1,169 | ​ | $ | (452) | ​ | $ | 696,925

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