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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2018
SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE [Abstract] |
Schedule of Net Revenues | Service revenue, net for the years ended December 31, 2018 and 2017 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
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Medicaid |  | $ | 50 |  | $ | 39 |  | $ | — |  | $ | — |  | $ | 50 |  | $ | 39
Medicare |  |  | 1,000 |  |  | 569 |  |  | — |  |  | — |  |  | 1,000 |  |  | 569
Self-pay |  |  | 138 |  |  | 103 |  |  | — |  |  | — |  |  | 138 |  |  | 103
Third party payers |  |  | 960 |  |  | 500 |  |  | — |  |  | — |  |  | 960 |  |  | 500
Contract diagnostics |  |  | — |  |  | — |  |  | 1,187 |  |  | 491 |  |  | 1,187 |  |  | 491
Revenues, net of contractual allowances |  | $ | 2,148 |  | $ | 1,211 |  | $ | 1,187 |  | $ | 491 |  | $ | 3,335 |  | $ | 1,702
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, 2018 and 2017.
(dollars in thousands) |  | For the Year Ended December 31,
|  |  |  | Contractual Allowances and |  | Revenues, net of Contractual
|  | Gross Revenues |  | adjustments |  | Allowances and adjustments
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Medicaid |  | $ | 86 |  | $ | 87 |  | $ | (36) |  | $ | (48) |  | $ | 50 |  | $ | 39
Medicare |  |  | 1,019 |  |  | 546 |  |  | (19) |  |  | 23 |  |  | 1,000 |  |  | 569
Self-pay |  |  | 138 |  |  | 131 |  |  | — |  |  | (28) |  |  | 138 |  |  | 103
Third party payers |  |  | 2,358 |  |  | 1,310 |  |  | (1,398) |  |  | (810) |  |  | 960 |  |  | 500
Contract diagnostics |  |  | 1,187 |  |  | 491 |  |  | — |  |  | — |  |  | 1,187 |  |  | 491
|  |  | 4,788 |  |  | 2,565 |  |  | (1,453) |  |  | (863) |  |  | 3,335 |  |  | 1,702
Clinical research grants and other |  |  | 113 |  |  | 331 |  |  | — |  |  | — |  |  | 113 |  |  | 331
|  | $ | 4,901 |  | $ | 2,896 |  | $ | (1,453) |  | $ | (863) |  | $ | 3,448 |  | $ | 2,033
Schedule of Reported Revenues Net of Collection Allowance | The following table presents our reported revenues net of the collection allowance and adjustments for the year ended December 31, 2018 and 2017.
|  | For the Year Ended December 31,
|  | Revenues, net of |  |  |  |
(dollars in thousands) |  | Contractual Allowances |  | Allowances for doubtful |  |
|  | and adjustments |  | accounts |  | Total
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Medicaid |  | $ | 50 |  | $ | 39 |  | $ | (50) |  | $ | (17) |  | $ | — |  | $ | 22
Medicare |  |  | 1,000 |  |  | 569 |  |  | (150) |  |  | (182) |  |  | 850 |  |  | 387
Self-pay |  |  | 138 |  |  | 103 |  |  | — |  |  | (31) |  |  | 138 |  |  | 72
Third party payers |  |  | 960 |  |  | 500 |  |  | (384) |  |  | (85) |  |  | 576 |  |  | 415
Contract diagnostics |  |  | 1,187 |  |  | 491 |  |  | — |  |  | — |  |  | 1,187 |  |  | 491
|  |  | 3,335 |  |  | 1,702 |  |  | (584) |  |  | (315) |  |  | 2,751 |  |  | 1,387
Clinical research grants and other |  |  | 113 |  |  | 331 |  |  | — |  |  | 5 |  |  | 113 |  |  | 336
|  | $ | 3,448 |  | $ | 2,033 |  | $ | (584) |  | $ | (310) |  | $ | 2,864 |  | $ | 1,723
Schedule of Receivables | The following summarizes the mix of receivables for the years ended December 31, 2018 and 2017:
|  | 2018 |  | 2017
Medicaid |  | $ | 82 |  | $ | 37
Medicare |  |  | 633 |  |  | 256
Self-pay |  |  | 108 |  |  | 53
Third party payers |  |  | 1,382 |  |  | 1,066
Contract diagnostic services |  |  | 193 |  |  | 445
Other |  |  | — |  |  | —
|  | $ | 2,398 |  | $ | 1,857
Less allowance for doubtful accounts |  |  | (1,708) |  |  | (1,127)
Accounts receivable, net |  | $ | 690 |  | $ | 730
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, 2018:
|  |  |  |  | Allowance for
|  |  |  |  | Doubtful
(dollars in thousands) |  |  |  |  | Accounts
Balance, January 1, 2018 |  |  |  |  | $ | (1,127)
Collection Allowance: |  |  |  |  |  |
Medicaid |  | $ | (50) |  |  |
Medicare |  |  | (150) |  |  |
Third party payers |  |  | (384) |  |  |
Service revenue, net |  |  | (584) |  |  |
Bad debt expense |  | $ | 3 |  |  |
Total charges |  |  |  |  |  | (581)
Balance, December 31, 2018 |  |  |  |  | $ | (1,708)

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