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MARKETABLE SECURITIES | 9 Months Ended
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Sep. 30, 2021
Cash and Cash Equivalents [Abstract] |
Marketable Securities | MARKETABLE SECURITIES The following table summarizes our marketable securities by significant investment categories as of September 30, 2021:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable equity securities | $ | 756 |  | $ | (224) |  | $ | 3 |  | $ | 535 |
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 |

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