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v3.22.2.2

Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
Marketable Securities |
Schedule of marketable debt securities, classified as available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross Unrealized
​ | ​ | Amortized | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 132,422 | ​ | $ | — | ​ | $ | (1,042) | ​ | $ | 131,380
Maturing after one year through three years | ​ | ​ | 3,912 | ​ | ​ | — | ​ | ​ | (71) | ​ | ​ | 3,841
Total U.S. government and municipal obligations | ​ | $ | 136,334 | ​ | $ | — | ​ | $ | (1,113) | ​ | $ | 135,221
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 168,698 | ​ | $ | — | ​ | $ | (1,548) | ​ | $ | 167,150
Maturing after one year through three years | ​ | ​ | 2,564 | ​ | ​ | — | ​ | ​ | (47) | ​ | ​ | 2,517
Total corporate debt securities | ​ | $ | 171,262 | ​ | $ | — | ​ | $ | (1,595) | ​ | $ | 169,667
Total marketable securities | ​ | $ | 307,596 | ​ | $ | — | ​ | $ | (2,708) | ​ | $ | 304,888
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross Unrealized
​ | ​ | Amortized | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Fair
​ | ​ | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 80,674 | ​ | $ | — | ​ | $ | (133) | ​ | $ | 80,541
Maturing after one year through three years | ​ | ​ | 51,319 | ​ | ​ | — | ​ | ​ | (184) | ​ | ​ | 51,135
Total U.S. government and municipal obligations | ​ | $ | 131,993 | ​ | $ | — | ​ | $ | (317) | ​ | $ | 131,676
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 170,034 | ​ | $ | — | ​ | $ | (28) | ​ | $ | 170,006
Maturing after one year through three years | ​ | ​ | 67,782 | ​ | ​ | — | ​ | ​ | (357) | ​ | ​ | 67,425
Total corporate debt securities | ​ | $ | 237,816 | ​ | $ | — | ​ | $ | (385) | ​ | $ | 237,431
Total marketable securities | ​ | $ | 369,809 | ​ | $ | — | ​ | $ | (702) | ​ | $ | 369,107

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