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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2022
Cash and Cash Equivalents [Abstract] |
Marketable Securities | The following table summarizes our marketable securities by significant investment categories as of June 30, 2022:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 11,435 |  | $ | — |  | $ | 5 |  | $ | 11,440 |
Marketable equity securities | 756 |  | (401) |  | — |  | 355 |
Total marketable securities | $ | 12,191 |  | $ | (401) |  | $ | 5 |  | $ | 11,795 |
(1) Marketable debt securities are comprised primarily of notes of U.S. government agency bonds. The following table summarizes our marketable securities by significant investment categories as of December 31, 2021:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable equity securities | $ | 756 |  | $ | (262) |  | $ | — |  | $ | 494 |

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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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