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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following tables summarize our marketable securities by significant investment categories as of December 31, 2020:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities | $ | — |  | $ | — |  | $ | — |  | $ | — |
Marketable equity securities | 824 |  | (418) |  | 1,841 |  | 2,247 |
Marketable securities | $ | 824 |  | $ | (418) |  | $ | 1,841 |  | $ | 2,247 |
The following tables summarize our marketable securities by significant investment categories as of December 31, 2019:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 4,171 |  | $ | — |  | $ | 37 |  | $ | 4,208 |
Marketable equity securities | 824 |  | (543) |  | 349 |  | 630 |
Marketable securities | $ | 4,995 |  | $ | (543) |  | $ | 386 |  | $ | 4,838 |
(1)Marketable debt securities are comprised primarily of U.S. government notes, and also includes U.S. government agencies, and tradeable certificates of deposits.

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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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