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MARKETABLE SECURITITES | 9 Months Ended
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Sep. 30, 2018
Marketable Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure | MARKETABLE SECURITIES: Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at September 30, 2018, were as follows:
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Market Value
(In thousands) |  | Gains |  | Losses |
Investments due in 3 months or less: |  |  |  |  |  |  |
Commercial paper | $ | 5,687 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,687 |
Corporate securities | 4,351 |  |  | — |  |  | (2 | ) |  | 4,349 |
Total | 10,038 |  |  | — |  |  | (2 | ) |  | 10,036 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 65,942 |  |  | — |  |  | (250 | ) |  | 65,692 |
Total | 65,942 |  |  | — |  |  | (250 | ) |  | 65,692 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 24,060 |  |  | — |  |  | (22 | ) |  | 24,038 |
Total | 24,060 |  |  | — |  |  | (22 | ) |  | 24,038 |
Total marketable securities | $ | 100,040 |  |  | $ | — |  |  | $ | (274 | ) |  | $ | 99,766 |
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2017, were as follows:
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Market Value
(In thousands) |  | Gains |  | Losses |
Investments due in 3 months or less: |  |  |  |  |  |  |
Corporate securities | $ | 38,485 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 38,469 |
Total | 38,485 |  |  | — |  |  | (16 | ) |  | 38,469 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 104,440 |  |  | — |  |  | (199 | ) |  | 104,241 |
Government securities | 9,302 |  |  | — |  |  | (17 | ) |  | 9,285 |
Total | 113,742 |  |  | — |  |  | (216 | ) |  | 113,526 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 37,436 |  |  | — |  |  | (195 | ) |  | 37,241 |
Total | 37,436 |  |  | — |  |  | (195 | ) |  | 37,241 |
Total marketable securities | $ | 189,663 |  |  | $ | — |  |  | $ | (427 | ) |  | $ | 189,236 |
As of September 30, 2018, and December 31, 2017, the Company evaluated the nature of the investments with a loss position, which were primarily high-quality corporate securities, and determined the unrealized losses were not other-than-temporary.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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