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MARKETABLE SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following table summarizes our marketable securities by significant investment categories as of March 31, 2021:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable equity securities | $ | 824 |  | $ | (399) |  | $ | 982 |  | $ | 1,407 |
Marketable securities | $ | 824 |  | $ | (399) |  | $ | 982 |  | $ | 1,407 |
The following table summarizes our marketable securities by significant investment categories as of December 31, 2020:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable equity securities | $ | 824 |  | $ | (418) |  | $ | 1,841 |  | $ | 2,247 |
Marketable securities | $ | 824 |  | $ | (418) |  | $ | 1,841 |  | $ | 2,247 |

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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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