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Marketable Securities | 6 Months Ended
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Jun. 30, 2022
Marketable Securities |
Marketable Securities | (4) Marketable Securities ​ The following is a summary of marketable debt securities, classified as available-for-sale: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross Unrealized
​ | ​ | Amortized | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | (In thousands)
June 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and municipal obligations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 152,518 | ​ | $ | — | ​ | $ | (1,494) | ​ | $ | 151,024
Maturing after one year through three years | ​ | ​ | 3,887 | ​ | ​ | — | ​ | ​ | (17) | ​ | ​ | 3,870
Total U.S. government and municipal obligations | ​ | $ | 156,405 | ​ | $ | — | ​ | $ | (1,511) | ​ | $ | 154,894
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Maturing in one year or less | ​ | $ | 149,304 | ​ | $ | — | ​ | $ | (829) | ​ | $ | 148,475
Maturing after one year through three years | ​ | ​ | 25,720 | ​ | ​ | — | ​ | ​ | (673) | ​ | ​ | 25,047
Total corporate debt securities | ​ | $ | 175,024 | ​ | $ | — | ​ | $ | (1,502) | ​ | $ | 173,522
Total marketable securities | ​ | $ | 331,429 | ​ | $ | — | ​ | $ | (3,013) | ​ | $ | 328,416
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ 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, 2022 and December 31, 2021. The unrealized losses are attributable to changes in interest rates and the Company does not believe any unrealized losses represent other-than-temporary impairments. Marketable securities include $1.1 million and $1.3 million in accrued interest at June 30, 2022 and December 31, 2021, respectively.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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