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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Tables) | 6 Months Ended
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Jun. 30, 2021
SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE [Abstract] |
Schedule of Net Revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended June 30,
(dollars in thousands) | ​ | Diagnostic Testing | ​ | Biomarker Testing | ​ | Total
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 18 | ​ | $ | 16 | ​ | $ | — | ​ | $ | — | ​ | $ | 18 | ​ | $ | 16
Medicare | ​ |  | 1,009 | ​ |  | 643 | ​ |  | — | ​ |  | — | ​ |  | 1,009 | ​ |  | 643
Self-pay | ​ |  | 69 | ​ |  | 86 | ​ |  | — | ​ |  | — | ​ |  | 69 | ​ |  | 86
Third party payers | ​ |  | 921 | ​ |  | 847 | ​ |  | — | ​ |  | — | ​ |  | 921 | ​ |  | 847
Contract diagnostics | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 24 | ​ |  | 21 | ​ |  | 24
Service revenue, net | ​ | $ | 2,017 | ​ | $ | 1,592 | ​ | $ | 21 | ​ | $ | 24 | ​ | $ | 2,038 | ​ | $ | 1,616
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended June 30,
(dollars in thousands) | ​ | Diagnostic Testing | ​ | Biomarker Testing | ​ | Total
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 31 | ​ | $ | 25 | ​ | $ | — | ​ | $ | — | ​ | $ | 31 | ​ | $ | 25
Medicare | ​ |  | 1,993 | ​ |  | 1,168 | ​ |  | — | ​ |  | — | ​ |  | 1,993 | ​ |  | 1,168
Self-pay | ​ |  | 116 | ​ |  | 136 | ​ |  | — | ​ |  | — | ​ |  | 116 | ​ |  | 136
Third party payers | ​ |  | 1,821 | ​ |  | 1,363 | ​ |  | — | ​ |  | — | ​ |  | 1,821 | ​ |  | 1,363
Contract diagnostics | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 382 | ​ |  | 21 | ​ |  | 382
Service revenue, net | ​ | $ | 3,961 | ​ | $ | 2,692 | ​ | $ | 21 | ​ | $ | 382 | ​ | $ | 3,982 | ​ | $ | 3,074
Schedule of Gross to Net Sales Adjustments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended June 30,
(dollars in thousands) | ​ | ​ | ​ | Contractual Allowances and | ​ | Revenues, net of Contractual
​ | ​ | Gross Revenues | ​ | adjustments | ​ | Allowances and adjustments
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 18 | ​ | $ | 16 | ​ | $ | — | ​ | $ | — | ​ | $ | 18 | ​ | $ | 16
Medicare | ​ |  | 1,009 | ​ |  | 643 | ​ |  | — | ​ |  | — | ​ |  | 1,009 | ​ |  | 643
Self-pay | ​ |  | 69 | ​ |  | 89 | ​ |  | — | ​ |  | (3) | ​ |  | 69 | ​ |  | 86
Third party payers | ​ |  | 3,225 | ​ |  | 2,949 | ​ |  | (2,304) | ​ |  | (2,102) | ​ |  | 921 | ​ |  | 847
Contract diagnostics | ​ |  | 21 | ​ |  | 24 | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 24
​ | ​ |  | 4,342 | ​ |  | 3,721 | ​ |  | (2,304) | ​ |  | (2,105) | ​ |  | 2,038 | ​ |  | 1,616
Other | ​ |  | 206 | ​ |  | 29 | ​ |  | — | ​ |  | — | ​ |  | 206 | ​ |  | 29
​ | ​ | $ | 4,548 | ​ | $ | 3,750 | ​ | $ | (2,304) | ​ | $ | (2,105) | ​ | $ | 2,244 | ​ | $ | 1,645
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended June 30,
(dollars in thousands) | ​ | ​ | ​ | Contractual Allowances and | ​ | Revenues, net of Contractual
​ | ​ | Gross Revenues | ​ | adjustments | ​ | Allowances and adjustments
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 31 | ​ | $ | 25 | ​ | $ | — | ​ | $ | — | ​ | $ | 31 | ​ | $ | 25
Medicare | ​ |  | 1,993 | ​ |  | 1,168 | ​ |  | — | ​ |  | — | ​ |  | 1,993 | ​ |  | 1,168
Self-pay | ​ |  | 116 | ​ |  | 139 | ​ |  | — | ​ |  | (3) | ​ |  | 116 | ​ |  | 136
Third party payers | ​ |  | 6,357 | ​ |  | 4,757 | ​ |  | (4,536) | ​ |  | (3,394) | ​ |  | 1,821 | ​ |  | 1,363
Contract diagnostics | ​ |  | 21 | ​ |  | 382 | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 382
​ | ​ |  | 8,518 | ​ |  | 6,471 | ​ |  | (4,536) | ​ |  | (3,397) | ​ |  | 3,982 | ​ |  | 3,074
Other | ​ |  | 373 | ​ |  | 53 | ​ |  | — | ​ |  | — | ​ |  | 373 | ​ |  | 53
​ | ​ | $ | 8,891 | ​ | $ | 6,524 | ​ | $ | (4,536) | ​ | $ | (3,397) | ​ | $ | 4,355 | ​ | $ | 3,127
Schedule of Reported Revenues Net of Collection Allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended June 30,
​ | ​ | Revenues, net of | ​ | ​ | ​ |
(dollars in thousands) | ​ | Contractual Allowances | ​ | Allowances for doubtful | ​ |
​ | ​ | and adjustments | ​ | accounts | ​ | Total
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 18 | ​ | $ | 16 | ​ | $ | 10 | ​ | $ | (16) | ​ | $ | 28 | ​ | $ | —
Medicare | ​ |  | 1,009 | ​ |  | 643 | ​ |  | 110 | ​ |  | (97) | ​ |  | 1,119 | ​ |  | 546
Self-pay | ​ |  | 69 | ​ |  | 86 | ​ |  | — | ​ |  | — | ​ |  | 69 | ​ |  | 86
Third party payers | ​ |  | 921 | ​ |  | 847 | ​ |  | (20) | ​ |  | (224) | ​ |  | 901 | ​ |  | 623
Contract diagnostics | ​ |  | 21 | ​ |  | 24 | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 24
​ | ​ |  | 2,038 | ​ |  | 1,616 | ​ |  | 100 | ​ |  | (337) | ​ |  | 2,138 | ​ |  | 1,279
Other | ​ |  | 206 | ​ |  | 29 | ​ |  | — | ​ |  | — | ​ |  | 206 | ​ |  | 29
​ | ​ | $ | 2,244 | ​ | $ | 1,645 | ​ | $ | 100 | ​ | $ | (337) | ​ | $ | 2,344 | ​ | $ | 1,308
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended June 30,
​ | ​ | Revenues, net of | ​ | ​ | ​ |
(dollars in thousands) | ​ | Contractual Allowances | ​ | Allowances for doubtful | ​ |
​ | ​ | and adjustments | ​ | accounts | ​ | Total
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Medicaid | ​ | $ | 31 | ​ | $ | 25 | ​ | $ | 1 | ​ | $ | (24) | ​ | $ | 32 | ​ | $ | 1
Medicare | ​ |  | 1,993 | ​ |  | 1,168 | ​ |  | 11 | ​ |  | (175) | ​ |  | 2,004 | ​ |  | 993
Self-pay | ​ |  | 116 | ​ |  | 136 | ​ |  | — | ​ |  | — | ​ |  | 116 | ​ |  | 136
Third party payers | ​ |  | 1,821 | ​ |  | 1,363 | ​ |  | (199) | ​ |  | (404) | ​ |  | 1,622 | ​ |  | 959
Contract diagnostics | ​ |  | 21 | ​ |  | 382 | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 382
​ | ​ |  | 3,982 | ​ |  | 3,074 | ​ |  | (187) | ​ |  | (603) | ​ |  | 3,795 | ​ |  | 2,471
Other | ​ |  | 373 | ​ |  | 53 | ​ |  | — | ​ |  | — | ​ |  | 373 | ​ |  | 53
​ | ​ | $ | 4,355 | ​ | $ | 3,127 | ​ | $ | (187) | ​ | $ | (603) | ​ | $ | 4,168 | ​ | $ | 2,524
Schedule of Receivables | The following summarizes the mix of receivables outstanding related to payer categories:
​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | June 30, 2021 |  | December 31, 2020
Medicaid | ​ | $ | 27 | ​ | $ | 131
Medicare | ​ |  | 435 | ​ |  | 1,054
Self-pay | ​ |  | 64 | ​ |  | 276
Third party payers | ​ |  | 1,193 | ​ |  | 3,373
Contract diagnostic services and other | ​ |  | 133 | ​ |  | 53
​ | ​ | $ | 1,852 | ​ | $ | 4,887
Less allowance for doubtful accounts | ​ |  | (1,409) | ​ |  | (4,013)
Accounts receivable, net | ​ | $ | 443 | ​ | $ | 874
Schedule of Allowance for Doubtful Accounts | The following table presents the roll-forward of the allowance for doubtful accounts for the six months ended June 30, 2021.
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Allowance for
​ | ​ | ​ | ​ | ​ | Doubtful
(dollars in thousands) | ​ | ​ | ​ | ​ | Accounts
Balance, January 1, 2021 |  | ​ |  | ​ | $ | (4,013)
Collection Allowance: |  | ​ |  | ​ |  |
Medicaid | ​ | $ | 1 | ​ |  |
Medicare | ​ |  | 11 | ​ |  |
Third party payers | ​ |  | (199) | ​ |  |
​ | ​ |  | (187) | ​ |  |
Bad debt expense | ​ | $ | (1) | ​ |  |
Total charges | ​ |  |  | ​ |  | (188)
Write-offs | ​ | ​ | ​ | ​ | ​ | 2,792
Balance, June 30, 2021 | ​ |  |  | ​ | $ | (1,409)
Schedule of Customer Revenue and Accounts Receivable Concentrations | Our customers are oncologists, hospitals, reference laboratories, physician-office laboratories, and pharma and biotech companies. Customers that accounted for 10% or greater of our net sales or accounts receivable for the identified periods is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net sales | ​ | ​ | Accounts receivable, as of | ​
​ | ​ | Three Months Ended | ​ | ​ | Six Months Ended | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | ​ | June 30, | ​ | ​ | June 30, | ​ | December 31, | ​
​ | ​ | 2021 | ​ | 2020 | ​ | ​ | 2021 | ​ | 2020 | ​ | ​ | 2021 | ​ | 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer A | ​ | 10 | % | 12 | % | ​ | * | ​ | 11 | % | ​ | * | ​ | * | ​
Customer B | ​ | * | ​ | 11 | % | ​ | * | ​ | * | ​ | ​ | * | ​ | * | ​
Customer C | ​ | * | ​ | * | ​ | ​ | * | ​ | 13 | % | ​ | * | ​ | * | ​
Customer D | ​ | * | ​ | * | ​ | ​ | * | ​ | * | ​ | ​ | 11 | % | * | ​
Customer E | ​ | * | ​ | * | ​ | ​ | * | ​ | * | ​ | ​ | 12 | % | * | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
* represents less than 10% | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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