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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2021
SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE [Abstract] |
Schedule of Net Revenues |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
(dollars in thousands) | ​ | Diagnostic Testing | ​ | Biomarker Testing | ​ | Total
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 43 | ​ | $ | 53 | ​ | $ | — | ​ | $ | — | ​ | $ | 43 | ​ | $ | 53
Medicare | ​ |  | 3,838 | ​ |  | 2,882 | ​ |  | — | ​ |  | — | ​ |  | 3,838 | ​ |  | 2,882
Self-pay | ​ |  | 234 | ​ |  | 408 | ​ |  | — | ​ |  | — | ​ |  | 234 | ​ |  | 408
Third party payers | ​ |  | 3,612 | ​ |  | 3,442 | ​ |  | — | ​ |  | — | ​ |  | 3,612 | ​ |  | 3,442
Contract diagnostics | ​ |  | — | ​ |  | — | ​ |  | 56 | ​ |  | 426 | ​ |  | 56 | ​ |  | 426
Service revenue, net | ​ | $ | 7,727 | ​ | $ | 6,785 | ​ | $ | 56 | ​ | $ | 426 | ​ | $ | 7,783 | ​ | $ | 7,211
Schedule of Gross to Net Sales Adjustments |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
(dollars in thousands) | ​ | ​ | ​ | Contractual Allowances and | ​ | Revenues, net of Contractual
​ | ​ | Gross Revenues | ​ | adjustments | ​ | Allowances and adjustments
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 43 | ​ | $ | 53 | ​ | $ | — | ​ | $ | — | ​ | $ | 43 | ​ | $ | 53
Medicare | ​ |  | 3,838 | ​ |  | 2,882 | ​ |  | — | ​ |  | — | ​ |  | 3,838 | ​ |  | 2,882
Self-pay | ​ |  | 234 | ​ |  | 411 | ​ |  | — | ​ |  | (3) | ​ |  | 234 | ​ |  | 408
Third party payers | ​ |  | 12,597 | ​ |  | 11,891 | ​ |  | (8,985) | ​ |  | (8,449) | ​ |  | 3,612 | ​ |  | 3,442
Contract diagnostics | ​ |  | 56 | ​ |  | 426 | ​ |  | — | ​ |  | — | ​ |  | 56 | ​ |  | 426
​ | ​ |  | 16,768 | ​ |  | 15,663 | ​ |  | (8,985) | ​ |  | (8,452) | ​ |  | 7,783 | ​ |  | 7,211
Other | ​ |  | 914 | ​ |  | 220 | ​ |  | — | ​ |  | — | ​ |  | 914 | ​ |  | 220
​ | ​ | $ | 17,682 | ​ | $ | 15,883 | ​ | $ | (8,985) | ​ | $ | (8,452) | ​ | $ | 8,697 | ​ | $ | 7,431
Schedule of Reported Revenues Net of Collection Allowance |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
​ | ​ | Revenues, net of | ​ | ​ | ​ |
(dollars in thousands) | ​ | Contractual Allowances | ​ | Allowances for doubtful | ​ |
​ | ​ | and adjustments | ​ | accounts | ​ | Total
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 43 | ​ | $ | 53 | ​ | $ | (5) | ​ | $ | (53) | ​ | $ | 38 | ​ | $ | —
Medicare | ​ |  | 3,838 | ​ |  | 2,882 | ​ |  | (58) | ​ |  | (387) | ​ |  | 3,780 | ​ |  | 2,495
Self-pay | ​ |  | 234 | ​ |  | 408 | ​ |  | — | ​ |  | — | ​ |  | 234 | ​ |  | 408
Third party payers | ​ |  | 3,612 | ​ |  | 3,442 | ​ |  | 215 | ​ |  | (899) | ​ |  | 3,827 | ​ |  | 2,543
Contract diagnostics | ​ |  | 56 | ​ |  | 426 | ​ |  | — | ​ |  | — | ​ |  | 56 | ​ |  | 426
​ | ​ |  | 7,783 | ​ |  | 7,211 | ​ |  | 152 | ​ |  | (1,339) | ​ |  | 7,935 | ​ |  | 5,872
Other | ​ |  | 914 | ​ |  | 220 | ​ |  | — | ​ |  | — | ​ |  | 914 | ​ |  | 220
​ | ​ | $ | 8,697 | ​ | $ | 7,431 | ​ | $ | 152 | ​ | $ | (1,339) | ​ | $ | 8,849 | ​ | $ | 6,092
Schedule of Receivables | The following summarizes the mix of receivables as of December 31, 2021 and 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | December 31, 2021 |  | December 31, 2020
Medicaid | ​ | $ | 45 | ​ | $ | 131
Medicare | ​ |  | 727 | ​ |  | 1,054
Self-pay | ​ |  | 139 | ​ |  | 276
Third party payers | ​ |  | 2,111 | ​ |  | 3,373
Contract diagnostic services and other | ​ |  | 159 | ​ |  | 53
​ | ​ | $ | 3,181 | ​ | $ | 4,887
Less allowance for doubtful accounts | ​ |  | (2,484) | ​ |  | (4,013)
Accounts receivable, net | ​ | $ | 697 | ​ | $ | 874
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, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Allowance for
​ | ​ | ​ | ​ | ​ | Doubtful
(dollars in thousands) | ​ | ​ | ​ | ​ | Accounts
Balance, January 1, 2021 |  | ​ |  | ​ | $ | (4,013)
Collection Allowance: |  | ​ |  | ​ |  |
Medicaid | ​ | $ | (5) | ​ |  |
Medicare | ​ |  | (58) | ​ |  |
Third party payers | ​ |  | 215 | ​ |  |
​ | ​ |  | 152 | ​ |  |
Bad debt expense | ​ | $ | (2) | ​ |  |
Total charges | ​ |  |  | ​ |  | 150
Write-offs | ​ | ​ | ​ | ​ | ​ | 1,379
Balance, December 31, 2021 | ​ |  |  | ​ | $ | (2,484)
Schedule of Customer Revenue and Accounts Receivable Concentrations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net sales | ​ | Accounts receivable, as of | ​
​ | ​ | Years Ended | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​ | December 31, | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer A | ​ | * | ​ | * | ​ | 21 | % | * | ​
Customer B | ​ | * | ​ | * | ​ | 12 | % | * | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* represents less than 10% | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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