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FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of fair value of impaired notes receivable |
| Level |  | June 30, 2021 |  | December 31, 2020
Cash equivalents | 2 |  | $ | 67,155 |  |  | $ | 177,912 |
Marketable securities | 2 |  | $ | 57,357 |  |  | $ | — |
Notes receivable | 2 |  | $ | 5,906 |  |  | $ | 2,937 |
Notes receivable impaired | 3 |  | $ | — |  |  | $ | 875 |
Accounts receivable | 2 |  | $ | 4,377 |  |  | $ | 3,901 |

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