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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
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, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 139,787 | ​ | $ | 14 | ​ | $ | (62) | ​ | $ | 139,739
Maturing after one year through three years | ​ | ​ | 93,179 | ​ | ​ | — | ​ | ​ | (275) | ​ | ​ | 92,904
Total U.S. government and municipal obligations | ​ | $ | 232,966 | ​ | $ | 14 | ​ | $ | (337) | ​ | $ | 232,643
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 371,025 | ​ | $ | 141 | ​ | $ | (142) | ​ | $ | 371,024
Maturing after one year through three years | ​ | ​ | 105,130 | ​ | ​ | 65 | ​ | ​ | (93) | ​ | ​ | 105,102
Total corporate debt securities | ​ | $ | 476,155 | ​ | $ | 206 | ​ | $ | (235) | ​ | $ | 476,126
Total marketable securities | ​ | $ | 709,121 | ​ | $ | 220 | ​ | $ | (572) | ​ | $ | 708,769
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 132,459 | ​ | $ | 143 | ​ | $ | (53) | ​ | $ | 132,549
Maturing after one year through three years | ​ | ​ | 26,009 | ​ | ​ | 77 | ​ | ​ | — | ​ | ​ | 26,086
Total U.S. government and municipal obligations | ​ | $ | 158,468 | ​ | $ | 220 | ​ | $ | (53) | ​ | $ | 158,635
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 183,625 | ​ | $ | 300 | ​ | $ | (10) | ​ | $ | 183,915
Maturing after one year through three years | ​ | ​ | 45,977 | ​ | ​ | 257 | ​ | ​ | — | ​ | ​ | 46,234
Total corporate debt securities | ​ | $ | 229,602 | ​ | $ | 557 | ​ | $ | (10) | ​ | $ | 230,149
Total marketable securities | ​ | $ | 388,070 | ​ | $ | 777 | ​ | $ | (63) | ​ | $ | 388,784

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