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MARKETABLE SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2023
MARKETABLE SECURITIES |
Schedule of 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, 2023, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate securities | ​ | $ | 36,088 | ​ | $ | — | ​ | $ | (207) | ​ | $ | 35,881
Total | ​ |  | 36,088 | ​ |  | — | ​ |  | (207) | ​ |  | 35,881
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 39,377 | ​ |  | 4 | ​ |  | (664) | ​ |  | 38,717
Total | ​ |  | 39,377 | ​ |  | 4 | ​ |  | (664) | ​ |  | 38,717
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 189,271 | ​ |  | 18 | ​ |  | (1,991) | ​ |  | 187,298
Total | ​ | ​ | 189,271 | ​ |  | 18 | ​ | ​ | (1,991) | ​ |  | 187,298
Total marketable securities | ​ | $ | 264,736 | ​ | $ | 22 | ​ | $ | (2,862) | ​ | $ | 261,896
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 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 | ​ | $ | 21,803 | ​ | $ | — | ​ | $ | (135) | ​ | $ | 21,668
Total | ​ |  | 21,803 | ​ |  | — | ​ |  | (135) | ​ |  | 21,668
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 173,833 | ​ |  | — | ​ |  | (4,019) | ​ |  | 169,814
Total | ​ |  | 173,833 | ​ |  | — | ​ |  | (4,019) | ​ |  | 169,814
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ | ​ | 58,128 | ​ |  | 71 | ​ |  | (1,240) | ​ |  | 56,959
Total | ​ |  | 58,128 | ​ |  | 71 | ​ |  | (1,240) | ​ |  | 56,959
Total marketable securities | ​ | $ | 253,764 | ​ | $ | 71 | ​ | $ | (5,394) | ​ | $ | 248,441
Schedule of 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, 2023:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | 200,713 | ​ | $ | (2,001) | ​ | $ | 55,695 | ​ | $ | (861) | ​ | $ | 256,408 | ​ | $ | (2,862)
Total marketable securities | ​ | $ | 200,713 | ​ | $ | (2,001) | ​ | $ | 55,695 | ​ | $ | (861) | ​ | $ | 256,408 | ​ | $ | (2,862)

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