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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (VIE) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |
Accounts receivable, net | $ 443 |  | $ 874 |  |  |
Total assets | 33,540 |  | 20,713 |  |  |
Liabilities: |  |  |  |  |  |
Accrued expenses | 1,343 |  | 2,036 |  |  |
Total liabilities | 6,282 |  | 6,551 |  |  |
Total stockholders' equity | 27,258 | $ 14,558 | 14,162 | $ 12,627 | $ 11,285 | $ 13,205
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Accounts receivable, net | 240 |  | 538 |  |  |
Total assets | 240 |  | 538 |  |  |
Liabilities: |  |  |  |  |  |
Accrued expenses | 7 |  | 27 |  |  |
Total liabilities | 7 |  | 27 |  |  |
Noncontrolling Interest in Joint Venture | 31 |  | 27 |  |  |
Total stockholders' equity | $ 61 |  | $ 53 |  |  |

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