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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 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)
June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 193,249 | ​ | $ | — | ​ | $ | (172) | ​ | $ | 193,077
Maturing after one year through three years | ​ | ​ | 124,096 | ​ | ​ | — | ​ | ​ | (383) | ​ | ​ | 123,713
Total U.S. government and municipal obligations | ​ | $ | 317,345 | ​ | $ | — | ​ | $ | (555) | ​ | $ | 316,790
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 403,773 | ​ | $ | 125 | ​ | $ | (314) | ​ | $ | 403,584
Maturing after one year through three years | ​ | ​ | 39,276 | ​ | ​ | 12 | ​ | ​ | (84) | ​ | ​ | 39,204
Total corporate debt securities | ​ | $ | 443,049 | ​ | $ | 137 | ​ | $ | (398) | ​ | $ | 442,788
Total marketable securities | ​ | $ | 760,394 | ​ | $ | 137 | ​ | $ | (953) | ​ | $ | 759,578
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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