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MARKETABLE SECURITIES | 9 Months Ended
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Sep. 30, 2018
Cash and Cash Equivalents [Abstract] |
CASH, CASH EQUIVALENTS AND AVALABLE FOR SALE ASSETS | The following tables summarize our marketable securities by significant investment categories as of September 30, 2018:
| Cost Basis | Gross Unrealized losses | Gross Unrealized gains | Fair Value
Marketable debt securities(1) | 25,525 |  | (38 | ) | 14 |  | 25,501 |
Marketable equity securities | 1,062 |  | (520 | ) | 1,125 |  | 1,667 |
Marketable securities | $ | 26,587 |  | $ | (558 | ) | $ | 1,139 |  | $ | 27,168 |
(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 tables summarize our marketable securities by significant investment categories as of December 31, 2017:
| Cost Basis | Gross Unrealized losses | Gross Unrealized gains | Fair Value
Marketable equity securities | $ | 1,062 |  | — |  | $ | 378 |  | $ | 1,034 |
Marketable securities | $ | 1,062 |  | — |  | $ | 378 |  | $ | 1,034 |
During the three and nine months ended September 30, 2017 and 2018, we did not recognize any significant other-than-temporary impairment losses. Losses on impairment are included as a component of other (loss) income in the Consolidated Statements of Operations. 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 | $ | 16,761 |
Due in 12 months to two years | 7,860 |
Due in greater than two years | 880 |
| $ | 25,501 |

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