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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (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] |  |  |  |
Revenue, net of contractual allowances and adjustments | $ 2,446 | $ 2,244 | $ 4,973 | $ 4,355
Adjustment for allowance for doubtful accounts | (87) | 100 | (167) | (187)
Net sales | 2,359 | 2,344 | 4,806 | 4,168
Medicaid [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 12 | 18 |  |
Adjustment for allowance for doubtful accounts | (6) | 10 | (13) |
Net sales | 6 | 28 |  |
Medicare [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 1,076 | 1,009 |  |
Adjustment for allowance for doubtful accounts | (27) | 110 | (51) |
Net sales | 1,049 | 1,119 |  |
Self-Pay [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 48 | 69 |  |
Net sales | 48 | 69 |  |
Third-Party Payor [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 1,090 | 921 |  |
Adjustment for allowance for doubtful accounts | (54) | (20) | (103) |
Net sales | 1,036 | 901 |  |
Contract Diagnostic Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments |  | 21 |  |
Net sales |  | 21 |  |
Service revenue, net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 2,226 | 2,038 | 4,231 | 3,982
Adjustment for allowance for doubtful accounts | (87) | 100 | (167) | (187)
Net sales | 2,139 | 2,138 | 4,064 | 3,795
Service revenue, net [Member] | Medicaid [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 12 | 18 | 27 | 31
Adjustment for allowance for doubtful accounts |  |  | (13) | 1
Net sales |  |  | 14 | 32
Service revenue, net [Member] | Medicare [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 1,076 | 1,009 | 2,050 | 1,993
Adjustment for allowance for doubtful accounts |  |  | (51) | 11
Net sales |  |  | 1,999 | 2,004
Service revenue, net [Member] | Self-Pay [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 48 | 69 | 97 | 116
Net sales |  |  | 97 | 116
Service revenue, net [Member] | Third-Party Payor [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 1,090 | 921 | 2,057 | 1,821
Adjustment for allowance for doubtful accounts |  |  | (103) | (199)
Net sales |  |  | 1,954 | 1,622
Service revenue, net [Member] | Contract Diagnostic Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments |  | 21 |  | 21
Net sales |  |  |  | 21
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 220 | 206 | 742 | 373
Net sales | 220 | 206 | $ 742 | $ 373
Other [Member] | Clinical Research Grants and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | $ 220 | $ 206 |  |

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