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CONVERTIBLE NOTES (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes 2021 and 2024 |
Schedule of Fair Value Assumptions | The following parameters were used: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 Notes | ​ | ​ | 2024 Notes | ​
Stock price (USD) |  | 1.34 | ​ | ​ | 1.34 | ​
Expected term |  | 0.23 | ​ | ​ | 3.03 | ​
Risk free rate |  | 0.05 | % | ​ | 0.44 | %
Volatility |  | 78.95 | % | ​ | 91.35 | %
Yield |  | 7.87 | % | ​ | 7.66 | %
2021 Notes |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized related to the 2021 Notes:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(U.S. Dollars in thousands) |  | 2019 |  | 2020 |  | 2021
Contractual interest expense | ​ | $ | 4,344 | ​ | $ | 4,344 | ​ | $ | 2,855
Debt discount amortization | ​ |  | 2,991 | ​ |  | 3,470 | ​ |  | 2,575
Loss from extinguishment | ​ |  | ​ | ​ |  | ​ | ​ |  | 831
Other expenses | ​ |  | ​ | ​ |  | 1,300 | ​ |  | ​
Total | ​ | $ | 7,335 | ​ | $ | 9,114 | ​ | $ | 6,261
2024 Notes |
Schedule of Fair Value Assumptions |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | 2024 Notes | ​
Stock price (USD) |  | ​ | ​ | ​ | 0.83 | ​
Expected term |  | ​ | ​ | ​ | 2.67 | ​
Risk free rate |  | ​ | ​ | ​ | 0.90 | %
Volatility |  | ​ | ​ | ​ | 92.79 | %
Yield |  | ​ | ​ | ​ | 10.31 | %
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized related to the 2024 Notes:
​ | ​ | ​ | ​
​ | ​ | ​
(U.S. dollars in thousands) |  | December 31, 2021
Contractual interest expense | ​ | $ | 767
Amortization of debt issuance costs and debt discount | ​ |  | 97
Total | ​ | $ | 864

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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