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CONVERTIBLE NOTES (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes 2018 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized for the years ended December 31, 2018 related to the 2018 Notes:
​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2018
Contractual interest expense | ​ | $ | 139
Amortization of debt issuance costs and debt discount | ​ |  | 15
Gain from early redemption | ​ |  | (32)
Total | ​ | $ | 122
Notes 2021 [Member] |
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) |  | 2018 |  | 2019 |  | 2020
Contractual interest expense | ​ | $ | 4,359 | ​ | $ | 4,344 | ​ | $ | 4,344
Debt discount amortization | ​ |  | 2,587 | ​ |  | 2,991 | ​ |  | 3,470
Interest payment in connection with conversions | ​ |  | 234 | ​ |  |  | ​ |  |
Loss in connection with conversions | ​ |  | 245 | ​ |  |  | ​ |  |
Other expenses | ​ |  | ​ | ​ |  |  | ​ |  | 1,300
Total | ​ | $ | 7,425 | ​ | $ | 7,335 | ​ | $ | 9,114

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