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Marketable Securities | 12 Months Ended
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Dec. 31, 2023
Marketable Securities |
Marketable Securities | (5) Marketable Securities The following is a summary of marketable debt securities, classified as available-for-sale: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | 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
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 97,246 | ​ | $ | 5 | ​ | $ | (369) | ​ | $ | 96,882
Maturing after one year through three years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total U.S. government and municipal obligations | ​ | $ | 97,246 | ​ | $ | 5 | ​ | $ | (369) | ​ | $ | 96,882
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 179,613 | ​ | $ | — | ​ | $ | (972) | ​ | $ | 178,641
Maturing after one year through three years | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total corporate debt securities | ​ | $ | 179,613 | ​ | $ | — | ​ | $ | (972) | ​ | $ | 178,641
Total marketable securities | ​ | $ | 276,859 | ​ | $ | 5 | ​ | $ | (1,341) | ​ | $ | 275,523
​ 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 December 31, 2023 and December 31, 2022 was $80.4 million and $133.9 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 the Company’s credit risk. As a result, the Company determined it did not hold any investments with a credit loss at December 31, 2023. Marketable securities include $1.9 million and $0.8 million in accrued interest at December 31, 2023 and December 31, 2022, respectively.

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