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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2019
SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE [Abstract] |
Schedule of Net Revenues | Service revenue, net for the years ended December 31, 2019 and 2018 was as follows (prior-period amounts are not adjusted under the modified-retrospective method of adoption):
|  | For the Year Ended December 31,
(dollars in thousands) |  | Diagnostic Testing |  | Biomarker Testing |  | Total
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Medicaid |  | $ | 28 |  | $ | 50 |  | $ | — |  | $ | — |  | $ | 28 |  | $ | 50
Medicare |  |  | 1,669 |  |  | 1,000 |  |  | — |  |  | — |  |  | 1,669 |  |  | 1,000
Self-pay |  |  | 34 |  |  | 138 |  |  | — |  |  | — |  |  | 34 |  |  | 138
Third party payers |  |  | 1,725 |  |  | 960 |  |  | — |  |  | — |  |  | 1,725 |  |  | 960
Contract diagnostics |  |  | — |  |  | — |  |  | 595 |  |  | 1,187 |  |  | 595 |  |  | 1,187
Service revenue, net |  | $ | 3,456 |  | $ | 2,148 |  | $ | 595 |  | $ | 1,187 |  | $ | 4,051 |  | $ | 3,335
Schedule of Gross to Net Sales Adjustments | The following table presents our revenues initially recognized for each associated payer class during the year ended December 31, 2019 and 2018.
(dollars in thousands) |  | For the Year Ended December 31,
|  |  |  | Contractual Allowances and |  | Revenues, net of Contractual
|  | Gross Revenues |  | adjustments |  | Allowances and adjustments
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Medicaid |  | $ | 31 |  | $ | 86 |  | $ | (3) |  | $ | (36) |  | $ | 28 |  | $ | 50
Medicare |  |  | 1,686 |  |  | 1,019 |  |  | (17) |  |  | (19) |  |  | 1,669 |  |  | 1,000
Self-pay |  |  | 34 |  |  | 138 |  |  | — |  |  | — |  |  | 34 |  |  | 138
Third party payers |  |  | 5,785 |  |  | 2,358 |  |  | (4,060) |  |  | (1,398) |  |  | 1,725 |  |  | 960
Contract diagnostics |  |  | 595 |  |  | 1,187 |  |  | — |  |  | — |  |  | 595 |  |  | 1,187
|  |  | 8,131 |  |  | 4,788 |  |  | (4,080) |  |  | (1,453) |  |  | 4,051 |  |  | 3,335
Clinical research grants and other |  |  | 44 |  |  | 113 |  |  | — |  |  | — |  |  | 44 |  |  | 113
|  | $ | 8,175 |  | $ | 4,901 |  | $ | (4,080) |  | $ | (1,453) |  | $ | 4,095 |  | $ | 3,448
Schedule of Reported Revenues Net of Collection Allowance [Table Text Block] | The following table presents our reported revenues net of the collection allowance and adjustments for the year ended December 31, 2019 and 2018.
|  | For the Year Ended December 31,
|  | Revenues, net of |  |  |  |
(dollars in thousands) |  | Contractual Allowances |  | Allowances for doubtful |  |
|  | and adjustments |  | accounts |  | Total
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Medicaid |  | $ | 28 |  | $ | 50 |  | $ | (28) |  | $ | (50) |  | $ | — |  | $ | —
Medicare |  |  | 1,669 |  |  | 1,000 |  |  | (251) |  |  | (150) |  |  | 1,418 |  |  | 850
Self-pay |  |  | 34 |  |  | 138 |  |  | — |  |  | — |  |  | 34 |  |  | 138
Third party payers |  |  | 1,725 |  |  | 960 |  |  | (689) |  |  | (384) |  |  | 1,036 |  |  | 576
Contract diagnostics |  |  | 595 |  |  | 1,187 |  |  | — |  |  | — |  |  | 595 |  |  | 1,187
|  |  | 4,051 |  |  | 3,335 |  |  | (968) |  |  | (584) |  |  | 3,083 |  |  | 2,751
Clinical research grants and other |  |  | 44 |  |  | 113 |  |  | — |  |  | — |  |  | 44 |  |  | 113
|  | $ | 4,095 |  | $ | 3,448 |  | $ | (968) |  | $ | (584) |  | $ | 3,127 |  | $ | 2,864
Schedule of Receivables | The following summarizes the mix of receivables for the years ended December 31, 2019 and 2018:
(dollars in thousands) |  | December 31, 2019 |  | December 31, 2018
Medicaid |  | $ | 107 |  | $ | 82
Medicare |  |  | 814 |  |  | 633
Self-pay |  |  | 88 |  |  | 108
Third party payers |  |  | 2,203 |  |  | 1,382
Contract diagnostic services |  |  | 36 |  |  | 193
|  | $ | 3,248 |  | $ | 2,398
Less allowance for doubtful accounts |  |  | (2,674) |  |  | (1,708)
Accounts receivable, net |  | $ | 574 |  | $ | 690
Schedule of Allowance for Doubtful Accounts | The following table presents the roll-forward of the allowance for doubtful accounts for the year ended December 31, 2019:
|  |  |  |  | Allowance for
|  |  |  |  | Doubtful
(dollars in thousands) |  |  |  |  | Accounts
Balance, January 1, 2019 |  |  |  |  | $ | (1,708)
Collection Allowance: |  |  |  |  |  |
Medicaid |  | $ | (28) |  |  |
Medicare |  |  | (251) |  |  |
Third party payers |  |  | (689) |  |  |
|  |  | (968) |  |  |
Bad debt expense |  | $ | 2 |  |  |
Total charges |  |  |  |  |  | (966)
Balance, December 31, 2019 |  |  |  |  | $ | (2,674)
Schedule of Customer Revenue and Accounts Receivable Concentrations | Customer revenue and accounts receivable concentration amounted to the following for the identified periods.
|  | Year Ended |
|  | December 31, |
|  | 2019 |  | 2018 |
Percentage of net sales by customer: |  |  |  |  |
Customer A |  | 19 | % | 33 | %
Customer B |  | 11 |  | * |
Customer C |  | * |  | * |
* represents less than 10% |  |  |  |  |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Percentage of total accounts receivable by customer: |  |  |  |  |  |
Customer A |  | * |  |  | 23 | %
Customer B |  | 17 | % |  | * |
Customer C |  | 12 | % |  | * |
* represents less than 10% |  |  |  |  |  |

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