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MARKETABLE SECURITITES (Tables) | 9 Months Ended
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Sep. 30, 2020
Marketable Securities [Abstract] |
Available-for-sale 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 |
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 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) |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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