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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2019
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following table summarizes our marketable securities by significant investment categories as of June 30, 2019:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 10,198 |  | $ | — |  | $ | 98 |  | $ | 10,296 |
Marketable equity securities | 1,062 |  | (535 | ) | 611 |  | 1,138 |
Marketable securities | $ | 11,260 |  | $ | (535 | ) | $ | 709 |  | $ | 11,434 |
(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 |
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 | $ | 8,893 |
Due in 12 months to two years | 1,403 |
Due in greater than two years | — |
| $ | 10,296 |

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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 marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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