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MARKETABLE SECURITITES | 9 Months Ended
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Sep. 30, 2020
Marketable Securities [Abstract] |
Marketable Securities Disclosure | MARKETABLE SECURITIES: Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at September 30, 2020, were as follows:
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Market Value
(In thousands) |  | Gains |  | Losses |
Investments due in 3 months or less: |  |  |  |  |  |  |
Commercial paper | $ | 46,251 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,251 |
Corporate securities | 18,119 |  |  | 52 |  |  | — |  |  | 18,171 |
Total | 64,370 |  |  | 52 |  |  | — |  |  | 64,422 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 136,410 |  |  | 1,366 |  |  | — |  |  | 137,776 |
Total | 136,410 |  |  | 1,366 |  |  | — |  |  | 137,776 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 9,582 |  |  | 146 |  |  | — |  |  | 9,728 |
Total | 9,582 |  |  | 146 |  |  | — |  |  | 9,728 |
Total marketable securities | $ | 210,362 |  |  | $ | 1,564 |  |  | $ | — |  |  | $ | 211,926 |
Accrued interest receivable was $1.4 million at September 30, 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 Cost |  | Gross Unrealized |  | Estimated Fair Market Value
(In thousands) |  | Gains |  | Losses |
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 September 30, 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
(In thousands) | Estimated Fair Market Value |  | Gross Unrealized Losses |  | Estimated Fair Market Value |  | Gross Unrealized Losses |  | Estimated Fair Market Value |  | Gross Unrealized Losses
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Corporate securities | $ | 13,069 |  |  | $ | (6) |  |  | $ | — |  |  | $ | — |  |  | $ | 13,069 |  |  | $ | (6) |
Total marketable securities | $ | 13,069 |  |  | $ | (6) |  |  | $ | — |  |  | $ | — |  |  | $ | 13,069 |  |  | $ | (6) |
In the three and nine months ended September 30, 2020, no unrealized losses on marketable securities were recognized in income.

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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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