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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | $ 1,645 | $ 1,199 | $ 3,127 | $ 2,116
less allowance for doubtful accounts | (337) | (257) | (603) | (461)
Net sales | 1,308 | 942 | 2,524 | 1,655
Medicaid [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 16 | 9 | 25 | 12
less allowance for doubtful accounts | (16) | (9) | (24) | (12)
Net sales |  |  | 1 |
Medicare [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 643 | 450 | 1,168 | 844
less allowance for doubtful accounts | (97) | (68) | (175) | (127)
Net sales | 546 | 382 | 993 | 717
Self-Pay [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 86 | 11 | 136 | 15
Net sales | 86 | 11 | 136 | 15
Third Party Payer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 847 | 451 | 1,363 | 807
less allowance for doubtful accounts | (224) | (180) | (404) | (322)
Net sales | 623 | 271 | 959 | 485
Contract Diagnostic Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 24 | 274 | 382 | 427
Net sales | 24 | 274 | 382 | 427
Clinical Research Grants and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 29 | 4 | 53 | 11
Net sales | 29 | 4 | 53 | 11
Service revenue, net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, net of contractual allowances and adjustments | 1,616 | 1,195 | 3,074 | 2,105
less allowance for doubtful accounts | (337) | (257) | (603) | (461)
Net sales | $ 1,279 | $ 938 | $ 2,471 | $ 1,644

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