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Marketable Securities | 6 Months Ended
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Jun. 30, 2024
Marketable Securities |
Marketable Securities | (4) Marketable Securities ​ The following is a summary 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
​ The Company holds investment-grade marketable securities. Unrealized losses are generally attributable to changes in interest rates. The aggregate fair value of marketable securities held by the Company in an unrealized loss position as of June 30, 2024 and December 31, 2023 was $614.4 million and $80.4 million, respectively. The Company has the intent and ability to hold its marketable securities until recovery and has determined that there has been no material change to their credit risk. As a result, the Company determined it did not hold any investments with a credit loss at June 30, 2024. Marketable securities include $4.8 million and $1.9 million in accrued interest at June 30, 2024 and December 31, 2023, respectively.

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