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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | $ 3,750 | $ 2,339 | $ 6,524 | $ 3,917
Contractual allowance and adjustments | (2,105) | (1,140) | (3,397) | (1,801)
Service revenue, net | 1,645 | 1,199 | 3,127 | 2,116
Medicaid [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 16 | 12 | 25 | 15
Contractual allowance and adjustments |  | (3) |  | (3)
Service revenue, net | 16 | 9 | 25 | 12
Medicare [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 643 | 467 | 1,168 | 861
Contractual allowance and adjustments |  | (17) |  | (17)
Service revenue, net | 643 | 450 | 1,168 | 844
Self-Pay [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 89 | 11 | 139 | 15
Contractual allowance and adjustments | (3) |  | (3) |
Service revenue, net | 86 | 11 | 136 | 15
Third Party Payer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 2,949 | 1,571 | 4,757 | 2,588
Contractual allowance and adjustments | (2,102) | (1,120) | (3,394) | (1,781)
Service revenue, net | 847 | 451 | 1,363 | 807
Contract Diagnostic Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 24 | 274 | 382 | 427
Service revenue, net | 24 | 274 | 382 | 427
Clinical Research Grants and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 29 | 4 | 53 | 11
Service revenue, net | 29 | 4 | 53 | 11
Service revenue, net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 3,721 | 2,335 | 6,471 | 3,906
Contractual allowance and adjustments | (2,105) | (1,140) | (3,397) | (1,801)
Service revenue, net | $ 1,616 | $ 1,195 | $ 3,074 | $ 2,105

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