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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2024
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, 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 | ​ | $ | 3,998 | ​ | $ | — | ​ | $ | (23) | ​ | $ | 3,975
Total | ​ |  | 3,998 | ​ |  | — | ​ |  | (23) | ​ |  | 3,975
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Commercial paper | ​ | ​ | 738 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 738
Corporate securities | ​ |  | 90,074 | ​ |  | 8 | ​ |  | (343) | ​ |  | 89,739
Total | ​ |  | 90,812 | ​ |  | 8 | ​ |  | (343) | ​ |  | 90,477
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 145,924 | ​ |  | 112 | ​ |  | (503) | ​ |  | 145,533
Total | ​ | ​ | 145,924 | ​ |  | 112 | ​ | ​ | (503) | ​ |  | 145,533
Total marketable securities | ​ | $ | 240,734 | ​ | $ | 120 | ​ | $ | (869) | ​ | $ | 239,985
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate securities | ​ | $ | 10,688 | ​ | $ | — | ​ | $ | (42) | ​ | $ | 10,646
Total | ​ |  | 10,688 | ​ |  | — | ​ |  | (42) | ​ |  | 10,646
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Commercial paper | ​ | ​ | 718 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 718
Corporate securities | ​ |  | 48,680 | ​ |  | 15 | ​ |  | (347) | ​ |  | 48,348
Total | ​ |  | 49,398 | ​ |  | 15 | ​ |  | (347) | ​ |  | 49,066
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ | ​ | 187,298 | ​ |  | 952 | ​ |  | (322) | ​ |  | 187,928
Total | ​ |  | 187,298 | ​ |  | 952 | ​ |  | (322) | ​ |  | 187,928
Total marketable securities | ​ | $ | 247,384 | ​ | $ | 967 | ​ | $ | (711) | ​ | $ | 247,640
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, 2024:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | 134,085 | ​ | $ | (435) | ​ | $ | 56,256 | ​ | $ | (434) | ​ | $ | 190,341 | ​ | $ | (869)
Total marketable securities | ​ | $ | 134,085 | ​ | $ | (435) | ​ | $ | 56,256 | ​ | $ | (434) | ​ | $ | 190,341 | ​ | $ | (869)

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