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MARKETABLE SECURITIES | 3 Months Ended
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Mar. 31, 2019
Cash and Cash Equivalents [Abstract] |
CASH, CASH EQUIVALENTS AND AVALABLE FOR SALE ASSETS | The following table summarizes our marketable securities by significant investment categories as of March 31, 2019:
| Cost Basis | Gross Unrealized losses | Gross Unrealized gains | Fair Value
Marketable debt securities(1) | $ | 16,070 |  | $ | — |  | $ | 116 |  | $ | 16,186 |
Marketable equity securities | 948 |  | (571 | ) | 891 |  | 1,268 |
Marketable securities | $ | 17,018 |  | $ | (571 | ) | $ | 1,007 |  | $ | 17,454 |
(1) Marketable debt securities are comprised primarily of U.S. government notes, and also includes U.S. government agencies and tradeable certificates of deposits. The following table summarizes our marketable securities by significant investment categories as of December 31, 2018:
| Cost Basis | Gross Unrealized losses | Gross Unrealized gains | Fair Value
Marketable debt securities (1) | $ | 25,523 |  | $ | (5 | ) | $ | 83 |  | $ | 25,601 |
Marketable equity securities | 1,062 |  | (549 | ) | 947 |  | 1,460 |
Marketable securities | $ | 26,585 |  | $ | (554 | ) | $ | 1,030 |  | $ | 27,061 |
(1) Marketable debt securities are comprised primarily of U.S. government notes, and also includes U.S. government agencies, and tradeable certificates of deposits. During the three months ended March 31, 2019 and 2018, we did not recognize any significant other-than-temporary impairment losses. The following table summarizes the estimated fair value of our investments in marketable debt securities with stated contractual maturity dates, accounted for as available-for-sale securities and classified by the contractual maturity date of the securities:
Due in less than 12 months | $ | 13,051 |
Due in 12 months to two years | 3,135 |
Due in greater than two years | — |
| $ | 16,186 |

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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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