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UNSECURED CONVERTIBLE NOTES (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Long-Term Debt Instruments | Unsecured convertible notes consisted of the following at December 31, 2023 and December 31, 2022, in thousand:
| ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022
2022 unsecured convertible notes, 5% coupon, due December 2023 | ​ | ​ | $  — | ​ | ​ | $18,879
2023 unsecured convertible notes, 4% coupon, due March 2024 | ​ | ​ | — | ​ | ​ | —
Total unsecured convertible notes, gross | ​ | ​ | — | ​ | ​ | 18,879
Less unamortized debt discounts | ​ | ​ | — | ​ | ​ | (35)
| ​ | ​ |  | ​ | ​ |
Total unsecured convertible notes, net of discount | ​ | ​ | $— | ​ | ​ | $18,844
Less current portion | ​ | ​ | — | ​ | ​ | 18,844
Total unsecured convertible notes, net of discount non-current | ​ | ​ | $— | ​ | ​ | $—

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