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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts receivable, gross | $ 4,785 | $ 3,248
Less allowance for doubtful accounts | (3,699) | (2,674)
Accounts receivable, net | 1,086 | 574
Medicaid [Member] |  |
Accounts receivable, gross | 132 | 107
Medicare [Member] |  |
Accounts receivable, gross | 1,002 | 814
Self-Pay [Member] |  |
Accounts receivable, gross | 403 | 88
Third Party Payer [Member] |  |
Accounts receivable, gross | 3,211 | 2,203
Contract Diagnostic Services [Member] |  |
Accounts receivable, gross | $ 37 | $ 36

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