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CONVERTIBLE NOTES (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes 2018 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized for the years ended December 31, 2017 and 2018 related to the 2018 Notes:
|  | December 31,
(U.S. dollars in thousands) |  | 2017 |  | 2018
Contractual interest expense |  | $ | 501 |  | $ | 139
Amortization of debt issuance costs and debt discount |  |  | 71 |  |  | 15
Gain from early redemption |  |  | — |  |  | (32)
Total |  | $ | 572 |  | $ | 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) |  | 2017 |  | 2018 |  | 2019
Contractual interest expense |  | $ | 4,434 |  | $ | 4,359 |  | $ | 4,344
Debt discount amortization |  |  | 2,309 |  |  | 2,587 |  |  | 2,991
Change in fair value of convertible note embedded derivative |  |  | 38,061 |  |  |  |  |  |
Interest payment in connection with conversions |  |  | 3,918 |  |  | 234 |  |  |
Loss (income) in connection with conversions |  |  | (1,643) |  |  | 245 |  |  |
Total |  | $ | 47,079 |  | $ | 7,425 |  | $ | 7,335
Notes 2022 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized related to the 2022 Notes:
|  | Year Ended
(U.S. Dollars in thousands) |  | December 31, 2017
Contractual interest expense |  | $ | 55
Debt premium amortization |  |  | (46)
Loss on extinguishment |  |  | 1,325
Total |  | $ | 1,334

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