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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 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)
March 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 178,109 | ​ | $ | 382 | ​ | $ | — | ​ | $ | 178,491
Maturing after one year through three years | ​ | ​ | 86,479 | ​ | ​ | 405 | ​ | ​ | (49) | ​ | ​ | 86,835
Total U.S. government and municipal obligations | ​ | $ | 264,588 | ​ | $ | 787 | ​ | $ | (49) | ​ | $ | 265,326
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 298,594 | ​ | $ | 241 | ​ | $ | (36) | ​ | $ | 298,799
Maturing after one year through three years | ​ | ​ | 92,001 | ​ | ​ | 109 | ​ | ​ | (80) | ​ | ​ | 92,030
Total corporate debt securities | ​ | $ | 390,595 | ​ | $ | 350 | ​ | $ | (116) | ​ | $ | 390,829
Total marketable securities | ​ | $ | 655,183 | ​ | $ | 1,137 | ​ | $ | (165) | ​ | $ | 656,155
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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