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MARKETABLE SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2022
Marketable Securities Abstract |
Available-for-sale Securities | Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at September 30, 2022, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate securities | ​ | $ | 8,412 | ​ | $ | — | ​ | $ | (36) | ​ | $ | 8,376
Total | ​ |  | 8,412 | ​ |  | — | ​ |  | (36) | ​ |  | 8,376
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 159,313 | ​ |  | — | ​ |  | (4,369) | ​ |  | 154,944
Total | ​ |  | 159,313 | ​ |  | — | ​ |  | (4,369) | ​ |  | 154,944
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 69,266 | ​ |  | — | ​ |  | (2,832) | ​ |  | 66,434
Total | ​ | ​ | 69,266 | ​ |  | — | ​ | ​ | (2,832) | ​ |  | 66,434
Total marketable securities | ​ | $ | 236,991 | ​ | $ | — | ​ | $ | (7,237) | ​ | $ | 229,754
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2021, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Commercial paper | ​ | $ | 89,965 | ​ | $ | — | ​ | $ | — | ​ | $ | 89,965
Corporate securities | ​ | ​ | 7,285 | ​ | ​ | — | ​ | ​ | (3) | ​ | ​ | 7,282
Total | ​ |  | 97,250 | ​ |  | — | ​ |  | (3) | ​ |  | 97,247
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 25,054 | ​ |  | — | ​ |  | (42) | ​ |  | 25,012
Total | ​ |  | 25,054 | ​ |  | — | ​ |  | (42) | ​ |  | 25,012
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ | ​ | 251,096 | ​ |  | 21 | ​ |  | (1,141) | ​ |  | 249,976
Total | ​ |  | 251,096 | ​ |  | 21 | ​ |  | (1,141) | ​ |  | 249,976
Total marketable securities | ​ | $ | 373,400 | ​ | $ | 21 | ​ | $ | (1,186) | ​ | $ | 372,235
Available-for-sale Securities in an Unrealized Loss Position | The following table summarizes marketable securities classified as available-for-sale (excluding cash equivalents) in a continuous unrealized loss position for which an allowance for credit losses was not recorded at September 30, 2022:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Longer | ​ | Total
​ |  | Estimated |  | Gross |  | Estimated |  | Gross |  | Estimated |  | Gross
​ | ​ | Fair Market | ​ | Unrealized | ​ | Fair Market | ​ | Unrealized | ​ | Fair Market | ​ | Unrealized
(In thousands) | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
Corporate securities | ​ | $ | 178,374 | ​ | $ | (5,520) | ​ | $ | 51,379 | ​ | $ | (1,717) | ​ | $ | 229,753 | ​ | $ | (7,237)
Total marketable securities | ​ | $ | 178,374 | ​ | $ | (5,520) | ​ | $ | 51,379 | ​ | $ | (1,717) | ​ | $ | 229,753 | ​ | $ | (7,237)

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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