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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | $ 7,431 | $ 4,095
less allowance for doubtful accounts | (1,339) | (968)
Net sales | 6,092 | 3,127
Medicaid [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 53 | 28
less allowance for doubtful accounts | (53) | (28)
Medicare [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 2,882 | 1,669
less allowance for doubtful accounts | (387) | (251)
Net sales | 2,495 | 1,418
Self-Pay [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 408 | 34
Net sales | 408 | 34
Third Party Payer [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 3,442 | 1,725
less allowance for doubtful accounts | (899) | (689)
Net sales | 2,543 | 1,036
Contract Diagnostic Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 426 | 595
Net sales | 426 | 595
Clinical Research Grants and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 220 | 44
Net sales | 220 | 44
Service revenue, net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | 7,211 | 4,051
less allowance for doubtful accounts | (1,339) | (968)
Net sales | 5,872 | 3,083
Service revenue, net [Member] | Services Revenue, Net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, net of contractual allowances and adjustments | $ 7,211 | $ 4,051

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