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MARKETABLE SECURITIES | 6 Months Ended
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Jun. 30, 2023
MARKETABLE SECURITIES |
MARKETABLE SECURITIES | 5. MARKETABLE SECURITIES: Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at June 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 | ​ | $ | 50,417 | ​ | $ | — | ​ | $ | (281) | ​ | $ | 50,136
Total | ​ |  | 50,417 | ​ |  | — | ​ |  | (281) | ​ |  | 50,136
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 78,042 | ​ |  | 7 | ​ |  | (1,383) | ​ |  | 76,666
Total | ​ |  | 78,042 | ​ |  | 7 | ​ |  | (1,383) | ​ |  | 76,666
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 137,055 | ​ |  | 38 | ​ |  | (1,676) | ​ |  | 135,417
Total | ​ | ​ | 137,055 | ​ |  | 38 | ​ | ​ | (1,676) | ​ |  | 135,417
Total marketable securities | ​ | $ | 265,514 | ​ | $ | 45 | ​ | $ | (3,340) | ​ | $ | 262,219
​ Accrued interest receivable was $2.0 million at June 30, 2023 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet. 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
​ Accrued interest receivable was $1.2 million at December 31, 2022 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet. 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, 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 | ​ | $ | 141,511 | ​ | $ | (1,584) | ​ | $ | 112,792 | ​ | $ | (1,756) | ​ | $ | 254,303 | ​ | $ | (3,340)
Total marketable securities | ​ | $ | 141,511 | ​ | $ | (1,584) | ​ | $ | 112,792 | ​ | $ | (1,756) | ​ | $ | 254,303 | ​ | $ | (3,340)
​ In the three and six months ended June 30, 2023 and 2022, no unrealized losses on marketable securities were recognized in income. The Company does not intend to sell and it is unlikely that it will be required to sell the securities prior to their anticipated recovery. The issuers are high quality (investment grade) and the decline in fair value is largely due to changes in interest rates. Additionally, the issuers continue to make timely interest payments on the marketable securities with the fair value expected to recover as they reach maturity.

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