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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts receivable, gross | $ 4,634 | $ 3,248
Less allowance for doubtful accounts | (3,280) | (2,674)
Accounts receivable, net | 1,354 | 574
Medicaid [Member] |  |
Accounts receivable, gross | 128 | 107
Medicare [Member] |  |
Accounts receivable, gross | 1,166 | 814
Self-Pay [Member] |  |
Accounts receivable, gross | 215 | 88
Third Party Payer [Member] |  |
Accounts receivable, gross | 2,861 | 2,203
Contract Diagnostic Services [Member] |  |
Accounts receivable, gross | $ 264 | $ 36

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