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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | $ 5,149 | $ 4,548 | $ 10,094 | $ 8,891
Contractual allowance and adjustments | (2,703) | (2,304) | (5,121) | (4,536)
Service revenue, net | 2,446 | 2,244 | 4,973 | 4,355
Medicaid [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenue, net | 12 | 18 |  |
Medicare [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenue, net | 1,076 | 1,009 |  |
Self-Pay [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenue, net | 48 | 69 |  |
Third-Party Payor [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenue, net | 1,090 | 921 |  |
Contract Diagnostic Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Service revenue, net |  | 21 |  |
Service revenue, net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 4,929 | 4,342 | 9,352 | 8,518
Contractual allowance and adjustments | (2,703) | (2,304) | (5,121) | (4,536)
Service revenue, net | 2,226 | 2,038 | 4,231 | 3,982
Service revenue, net [Member] | Medicaid [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 12 | 18 | 27 | 31
Service revenue, net | 12 | 18 | 27 | 31
Service revenue, net [Member] | Medicare [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 1,076 | 1,009 | 2,050 | 1,993
Service revenue, net | 1,076 | 1,009 | 2,050 | 1,993
Service revenue, net [Member] | Self-Pay [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 48 | 69 | 97 | 116
Service revenue, net | 48 | 69 | 97 | 116
Service revenue, net [Member] | Third-Party Payor [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 3,793 | 3,225 | 7,178 | 6,357
Contractual allowance and adjustments | (2,703) | (2,304) | (5,121) | (4,536)
Service revenue, net | 1,090 | 921 | 2,057 | 1,821
Service revenue, net [Member] | Contract Diagnostic Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue |  | 21 |  | 21
Service revenue, net |  | 21 |  | 21
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue |  |  | 742 | 373
Service revenue, net | 220 | 206 | $ 742 | $ 373
Other [Member] | Clinical Research Grants and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Gross revenue | 220 | 206 |  |
Service revenue, net | $ 220 | $ 206 |  |

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