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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2025
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 June 30, 2025, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate securities | ​ | $ | 15,661 | ​ | $ | 7 | ​ | $ | (10) | ​ | $ | 15,658
Total | ​ |  | 15,661 | ​ |  | 7 | ​ |  | (10) | ​ |  | 15,658
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ | ​ | 25,976 | ​ | ​ | 94 | ​ | ​ | (6) | ​ | ​ | 26,064
Total | ​ |  | 25,976 | ​ |  | 94 | ​ |  | (6) | ​ |  | 26,064
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 158,421 | ​ |  | 1,663 | ​ |  | (5) | ​ |  | 160,079
Total | ​ | ​ | 158,421 | ​ |  | 1,663 | ​ | ​ | (5) | ​ |  | 160,079
Total marketable securities | ​ | $ | 200,058 | ​ | $ | 1,764 | ​ | $ | (21) | ​ | $ | 201,801
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2024, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate securities | ​ | $ | 10,972 | ​ | $ | 4 | ​ | $ | (3) | ​ | $ | 10,973
Total | ​ |  | 10,972 | ​ |  | 4 | ​ |  | (3) | ​ |  | 10,973
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 87,346 | ​ |  | 159 | ​ |  | (19) | ​ |  | 87,486
Total | ​ |  | 87,346 | ​ |  | 159 | ​ |  | (19) | ​ |  | 87,486
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ | ​ | 149,817 | ​ |  | 860 | ​ |  | (113) | ​ |  | 150,564
Total | ​ |  | 149,817 | ​ |  | 860 | ​ |  | (113) | ​ |  | 150,564
Total marketable securities | ​ | $ | 248,135 | ​ | $ | 1,023 | ​ | $ | (135) | ​ | $ | 249,023
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 June 30, 2025:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | 9,205 | ​ | $ | (17) | ​ | $ | 2,925 | ​ | $ | (4) | ​ | $ | 12,130 | ​ | $ | (21)
Total marketable securities | ​ | $ | 9,205 | ​ | $ | (17) | ​ | $ | 2,925 | ​ | $ | (4) | ​ | $ | 12,130 | ​ | $ | (21)

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