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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of Credit Risk (Details) - Purchases [Member] - Customer Concentration Risk [Member] | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020
Single Vendor [Member] |  |
Concentration Risk Percentage [Abstract] |  |
Concentration credit risk percentage | 29.00% |
Different Vendor [Member] |  |
Concentration Risk Percentage [Abstract] |  |
Concentration credit risk percentage |  | 23.00%

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