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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Tables) | 3 Months Ended
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Mar. 31, 2022
SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE [Abstract] |
Schedule of Net Revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended March 31,
(dollars in thousands) | ​ | Diagnostic Testing | ​ | Biomarker Testing | ​ | Total
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Medicaid | ​ | $ | 15 | ​ | $ | 13 | ​ | $ | — | ​ | $ | — | ​ | $ | 15 | ​ | $ | 13
Medicare | ​ |  | 974 | ​ |  | 984 | ​ |  | — | ​ |  | — | ​ |  | 974 | ​ |  | 984
Self-pay | ​ |  | 49 | ​ |  | 47 | ​ |  | — | ​ |  | — | ​ |  | 49 | ​ |  | 47
Third party payers | ​ |  | 967 | ​ |  | 900 | ​ |  | — | ​ |  | — | ​ |  | 967 | ​ |  | 900
Contract diagnostics | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Service revenue, net | ​ | $ | 2,005 | ​ | $ | 1,944 | ​ | $ | — | ​ | $ | — | ​ | $ | 2,005 | ​ | $ | 1,944
​
Schedule of Gross to Net Sales Adjustments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended March 31,
(dollars in thousands) | ​ | ​ | ​ | Contractual Allowances and | ​ | Revenues, net of Contractual
​ | ​ | Gross Revenues | ​ | adjustments | ​ | Allowances and adjustments
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Medicaid | ​ | $ | 15 | ​ | $ | 13 | ​ | $ | — | ​ | $ | — | ​ | $ | 15 | ​ | $ | 13
Medicare | ​ |  | 974 | ​ |  | 984 | ​ |  | — | ​ |  | — | ​ |  | 974 | ​ |  | 984
Self-pay | ​ |  | 49 | ​ |  | 47 | ​ |  | — | ​ |  | — | ​ |  | 49 | ​ |  | 47
Third party payers | ​ |  | 3,385 | ​ |  | 3,133 | ​ |  | (2,418) | ​ |  | (2,233) | ​ |  | 967 | ​ |  | 900
Contract diagnostics | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ |  | 4,423 | ​ |  | 4,177 | ​ |  | (2,418) | ​ |  | (2,233) | ​ |  | 2,005 | ​ |  | 1,944
Other | ​ |  | 522 | ​ |  | 167 | ​ |  | — | ​ |  | — | ​ |  | 522 | ​ |  | 167
​ | ​ | $ | 4,945 | ​ | $ | 4,344 | ​ | $ | (2,418) | ​ | $ | (2,233) | ​ | $ | 2,527 | ​ | $ | 2,111
Schedule of Reported Revenues Net of Collection Allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended March 31,
​ | ​ | Revenues, net of | ​ | ​ | ​ |
(dollars in thousands) | ​ | Contractual Allowances | ​ | Allowances for doubtful | ​ |
​ | ​ | and adjustments | ​ | accounts | ​ | Total
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Medicaid | ​ | $ | 15 | ​ | $ | 13 | ​ | $ | (7) | ​ | $ | (8) | ​ | $ | 8 | ​ | $ | 5
Medicare | ​ |  | 974 | ​ |  | 984 | ​ |  | (24) | ​ |  | (99) | ​ |  | 950 | ​ |  | 885
Self-pay | ​ |  | 49 | ​ |  | 47 | ​ |  | — | ​ |  | — | ​ |  | 49 | ​ |  | 47
Third party payers | ​ |  | 967 | ​ |  | 900 | ​ |  | (49) | ​ |  | (180) | ​ |  | 918 | ​ |  | 720
Contract diagnostics | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ |  | 2,005 | ​ |  | 1,944 | ​ |  | (80) | ​ |  | (287) | ​ |  | 1,925 | ​ |  | 1,657
Other | ​ |  | 522 | ​ |  | 167 | ​ |  | — | ​ |  | — | ​ |  | 522 | ​ |  | 167
​ | ​ | $ | 2,527 | ​ | $ | 2,111 | ​ | $ | (80) | ​ | $ | (287) | ​ | $ | 2,447 | ​ | $ | 1,824
​
Schedule of Receivables | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | March 31, 2022 |  | December 31, 2021
Medicaid | ​ | $ | 45 | ​ | $ | 45
Medicare | ​ |  | 963 | ​ |  | 727
Self-pay | ​ |  | 229 | ​ |  | 139
Third party payers | ​ |  | 1,596 | ​ |  | 2,111
Contract diagnostic services and other | ​ |  | 347 | ​ |  | 159
​ | ​ | $ | 3,180 | ​ | $ | 3,181
Less allowance for doubtful accounts | ​ |  | (2,026) | ​ |  | (2,484)
Accounts receivable, net | ​ | $ | 1,154 | ​ | $ | 697
Schedule of Allowance for Doubtful Accounts | The following table presents the roll-forward of the allowance for doubtful accounts for the three months ended March 31, 2022.
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Allowance for
​ | ​ | ​ | ​ | ​ | Doubtful
(dollars in thousands) | ​ | ​ | ​ | ​ | Accounts
Balance, January 1, 2022 |  | ​ |  | ​ | $ | (2,484)
Collection Allowance: |  | ​ |  | ​ |  |
Medicaid | ​ | $ | (7) | ​ |  |
Medicare | ​ |  | (24) | ​ |  |
Third party payers | ​ |  | (49) | ​ |  |
​ | ​ |  | (80) | ​ |  |
Bad debt expense | ​ | $ | 2 | ​ |  |
Total charges | ​ |  |  | ​ |  | (78)
Other | ​ | ​ | ​ | ​ | ​ | 536
Balance, March 31, 2022 | ​ |  |  | ​ | $ | (2,026)
Schedule of Customer Revenue and Accounts Receivable Concentrations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net sales | ​ | ​ | Accounts receivable, as of | ​
​ | ​ | Three Months Ended | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | ​ | March 31, | ​ | December 31, | ​
​ | ​ | 2022 | ​ | 2021 | ​ | ​ | 2022 | ​ | 2021 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer A | ​ | 10 | % | * | ​ | ​ | 19 | % | 21 | %
Customer B | ​ | * | ​ | * | ​ | ​ | 11 | % | * | ​
Customer C | ​ | * | ​ | * | ​ | ​ | * | ​ | 12 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* represents less than 10% | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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