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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following tables summarize 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. 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 |
Available-for-sale Debt Securities | 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 | $ | 17,434 |
Due in 12 months to two years | 8,167 |
| $ | 25,601 |

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