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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Customer Revenue and Accounts Receivable Concentrations) (Details) - Customer Concentration Risk [Member] | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Sales Revenue, Net [Member] | Customer A [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 27.00%
Sales Revenue, Net [Member] | Customer B [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 10.00%
Accounts Receivable [Member] | Customer C [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 11.00% |

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