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CONVERTIBLE NOTES (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Instrument [Line Items] |
Schedule of debt | Long-term debt consists of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Dollars in Thousands
​ |  | June 30, 2021 |  | December 31, 2020
Department of Economic and Community Development (DECD) | ​ | $ | 219 | ​ | $ | 233
DECD debt issuance costs | ​ |  | (20) | ​ |  | (22)
Financed insurance loan | ​ |  | — | ​ |  | 12
Paycheck Protection Program | ​ | ​ | — | ​ | ​ | 787
Total long-term debt | ​ |  | 199 | ​ |  | 1,010
Current portion of long-term debt | ​ |  | (25) | ​ |  | (648)
Long-term debt, net of current maturities | ​ | $ | 174 | ​ | $ | 362
Convertible Bridge Loan |
Debt Instrument [Line Items] |
Summary of change in Bridge Note debt discounts and debt premiums | During the three and six months ended June 30, 2020, the change in Bridge Note debt discounts and debt premiums was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | For the Three Months Ended June 30,
​ | ​ | 2020
​ | ​ | ​ | Debt Discounts | ​ | ​ | Debt Premiums
Beginning balance at April 1 | ​ | $ | — | ​ | $ | 679
Deductions: | ​ | ​ | ​ | ​ | ​ | ​
Amortization (accretion) (1) | ​ | ​ | — | ​ | ​ | (346)
Write-off related to note conversions (2) | ​ | ​ | — | ​ | ​ | (333)
Balance at June 30 | ​ | $ | — | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended June 30,
​ | ​ | 2020
​ | ​ | ​ | Debt Discounts | ​ | ​ | Debt Premiums
Beginning balance at January 1 | ​ | $ | (1,796) | ​ | $ | —
Additions: | ​ |  | — | ​ |  | 793
Deductions: | ​ | ​ | ​ | ​ | ​ | ​
Amortization (accretion) (1) | ​ | ​ | 703 | ​ | ​ | (385)
Write-off related to note conversions (2) | ​ | ​ | 138 | ​ | ​ | (408)
Write-off related to note extinguishment (3) | ​ | ​ | 955 | ​ | ​ | —
Balance at June 30 | ​ | $ | — | ​ | $ | —
​
| (1) | Amortization/accretion is recognized as interest expense/income within the condensed consolidated statements of operations based on the effective interest method.
| (2) | Write-offs associated with note conversions are recognized as an offset to additional paid-in capital at the time of the conversion.
| (3) | Write-offs associated with note extinguishment are recognized as a loss and included in loss on extinguishment of convertible notes in the condensed consolidated statements of operations.

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