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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (VIE) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Assets: |  |  |  |
Accounts receivable, net | $ 625 | $ 874 |  |
Total assets | 20,423 | 20,713 |  |
Liabilities: |  |  |  |
Accrued expenses | 1,761 | 2,036 |  |
Total liabilities | 5,865 | 6,551 |  |
Total stockholders' equity | 14,558 | 14,162 | $ 11,285 | $ 13,205
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Assets: |  |  |  |
Accounts receivable, net | 390 | 538 |  |
Total assets | 390 | 538 |  |
Liabilities: |  |  |  |
Accrued expenses | 15 | 27 |  |
Total liabilities | 15 | 27 |  |
Noncontrolling Interest in Joint Venture | 28 | 27 |  |
Total stockholders' equity | $ 56 | $ 53 |  |

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