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Marketable Securities | 6 Months Ended
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Jun. 30, 2023
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, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 96,632 | ​ | $ | — | ​ | $ | (268) | ​ | $ | 96,364
Maturing after one year through three years | ​ | ​ | 10,716 | ​ | ​ | — | ​ | ​ | (34) | ​ | ​ | 10,682
Total U.S. government and municipal obligations | ​ | $ | 107,348 | ​ | $ | — | ​ | $ | (302) | ​ | $ | 107,046
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 73,263 | ​ | $ | 1 | ​ | $ | (144) | ​ | $ | 73,120
Maturing after one year through three years | ​ | ​ | 44,387 | ​ | ​ | 1 | ​ | ​ | (81) | ​ | ​ | 44,307
Total corporate debt securities | ​ | $ | 117,650 | ​ | $ | 2 | ​ | $ | (225) | ​ | $ | 117,427
Total marketable securities | ​ | $ | 224,998 | ​ | $ | 2 | ​ | $ | (527) | ​ | $ | 224,473
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
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, and none were in a continuous unrealized loss position for more than twelve months as of June 30, 2023 and December 31, 2022. The unrealized losses are attributable to changes in interest rates and the Company does not believe any unrealized losses represent other-than-temporary impairments. The Company has the intent and ability to hold such 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, 2023. ​ Marketable securities include $1.3 million and $0.8 million in accrued interest at June 30, 2023 and December 31, 2022, respectively.

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