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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2020
Marketable Securities [Abstract] |
MARKETABLE SECURITIES [Text Block] | 5. MARKETABLE SECURITIES: Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2020, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Commercial paper | ​ | $ | 43,660 | ​ | $ | — | ​ | $ | — | ​ | $ | 43,660
Corporate securities | ​ | ​ | 19,846 | ​ | ​ | 44 | ​ | ​ | — | ​ | ​ | 19,890
Total | ​ |  | 63,506 | ​ |  | 44 | ​ |  | — | ​ |  | 63,550
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 125,922 | ​ |  | 846 | ​ |  | — | ​ |  | 126,768
Total | ​ |  | 125,922 | ​ |  | 846 | ​ |  | — | ​ |  | 126,768
Total marketable securities | ​ | $ | 189,428 | ​ | $ | 890 | ​ | $ | — | ​ | $ | 190,318
​ The Company did not have any investments due in twelve months or greater as of December 31, 2020. Accrued interest receivable was $0.8 million at December 31, 2020 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, 2019, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Corporate securities | ​ | $ | 15,934 | ​ | $ | 18 | ​ | $ | — | ​ | $ | 15,952
Total | ​ |  | 15,934 | ​ |  | 18 | ​ |  | — | ​ |  | 15,952
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 71,223 | ​ |  | 269 | ​ |  | — | ​ |  | 71,492
Total | ​ |  | 71,223 | ​ |  | 269 | ​ |  | — | ​ |  | 71,492
Investments due in 12 months or greater: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ |  | 144,658 | ​ |  | 302 | ​ |  | (6) | ​ |  | 144,954
Total | ​ |  | 144,658 | ​ |  | 302 | ​ |  | (6) | ​ |  | 144,954
Total marketable securities | ​ | $ | 231,815 | ​ | $ | 589 | ​ | $ | (6) | ​ | $ | 232,398
​ Accrued interest receivable was $1.3 million at December 31, 2019 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet. ​ As of December 31, 2020, the Company had no 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. 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 December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate securities | ​ | $ | 13,069 | ​ | $ | (6) | ​ | $ | — | ​ | $ | — | ​ | $ | 13,069 | ​ | $ | (6)
Total marketable securities | ​ | $ | 13,069 | ​ | $ | (6) | ​ | $ | — | ​ | $ | — | ​ | $ | 13,069 | ​ | $ | (6)
​ The weighted average interest rate of investments at December 31, 2020 and 2019, was approximately 0.89% and 2.17%, respectively. In the year ended December 31, 2020, no unrealized losses on marketable securities were recognized in income.

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