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MARKETABLE SECURITIES | 3 Months Ended
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Mar. 31, 2021
Marketable Securities [Abstract] |
MARKETABLE SECURITIES | 5. MARKETABLE SECURITIES: Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at March 31, 2021, were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Commercial paper | ​ | $ | 1,999 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,999
Corporate securities | ​ | ​ | 94,676 | ​ | ​ | 107 | ​ | ​ | — | ​ | ​ | 94,783
Total | ​ |  | 96,675 | ​ |  | 107 | ​ |  | — | ​ |  | 96,782
Investments due in 4-12 months: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Commercial paper | ​ | ​ | 19,983 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 19,983
Corporate securities | ​ |  | 31,099 | ​ |  | 203 | ​ |  | — | ​ |  | 31,302
Total | ​ |  | 51,082 | ​ |  | 203 | ​ |  | — | ​ |  | 51,285
Total marketable securities | ​ | $ | 147,757 | ​ | $ | 310 | ​ | $ | — | ​ | $ | 148,067
​ Accrued interest receivable was $1.2 million at March 31, 2021 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, 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
​ 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.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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