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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Gross to Net Sales Adjustments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Gross revenue | $ 2,773 | $ 1,578
Contractual allowance and adjustments | (1,291) | (661)
Service revenue, net | 1,482 | 917
Medicaid [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 9 | 3
Service revenue, net | 9 | 3
Medicare [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 524 | 394
Service revenue, net | 524 | 394
Self-Pay [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 50 | 4
Service revenue, net | 50 | 4
Third Party Payer [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 1,808 | 1,017
Contractual allowance and adjustments | (1,291) | (661)
Service revenue, net | 517 | 356
Contract Diagnostic Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 358 | 153
Service revenue, net | 358 | 153
Clinical Research Grants and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Service revenue, net | 24 | 7
Service revenue, net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 2,749 | 1,571
Contractual allowance and adjustments | (1,291) | (661)
Service revenue, net | 1,458 | 910
Clinical Research Grants and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Gross revenue | 24 | 7
Service revenue, net | $ 24 | $ 7

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