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CONVERTIBLE NOTES (Tables) | 12 Months Ended
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Dec. 31, 2018
Seven Point Five Percentage Convertible Notes [Member] |
Fair Value Measurements, Recurring and Nonrecurring | The Company prepared a valuation of the fair value of the 2021 Notes (a Level 3 valuation) for the issuance dates. The value of the 2021 Notes was estimated by implementing the binomial model. The liability component was valued based on the Income Approach. The following parameters were used:
|  | December 7, 2016 |  |  | July 24, 2017 |
Stock price (USD) |  |  | 0.3 |  |  |  | 0.77 |
Expected term |  |  | 4.94 |  |  |  | 4.32 |
Risk free rate |  |  | 1.86 | % |  |  | 1.74 | %
Volatility |  |  | 54.12 | % |  |  | 63.79 | %
Yield |  |  | 13.98 | % |  |  | 11.56 | %
Four Point Five Percentage Convertible Notes One [Member] |
Fair Value Measurements, Recurring and Nonrecurring | The Company prepared a valuation of the fair value of the 2022 Notes (a Level 3 valuation) for the issuance date. The value of the 2022 Notes was estimated by implementing the binomial model. The liability component was valued based on the Income Approach. The following parameters were used:
|  | July 24, 2017 |
Stock price (USD) |  |  | 0.77 |
Expected term |  |  | 4.57 |
Risk free rate |  |  | 1.78 | %
Volatility |  |  | 62.68 | %
Yield |  |  | 15.21 | %
Notes 2018 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized for the years ended December 31, 2016, 2017 and 2018 related to the 2018 Notes:
|  | Year ended December 31, |
(U.S. Dollars in thousands) |  | 2016 |  |  | 2017 |  |  | 2018 |
Contractual interest expense |  | $ | 2,943 |  |  | $ | 501 |  |  | $ | 139 |
Amortization of debt issuance costs and debt discount |  |  | 421 |  |  |  | 71 |  |  |  | 15 |
Gain from early redemption |  |  |  |  |  |  |  |  |  |  | (32 | )
Total |  | $ | 3,364 |  |  | $ | 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) |  | 2016 |  |  | 2017 |  |  | 2018 |
Contractual interest expense |  | $ | 313 |  |  | $ | 4,434 |  |  | $ | 4,359 |
Debt discount amortization |  |  | 147 |  |  |  | 2,309 |  |  |  | 2,587 |
Gain on extinguishment |  |  | (14,063 | ) |  |  |  |  |  |  |  |
Change in fair value of convertible note embedded derivative |  |  | 6,473 |  |  |  | 38,061 |  |  |  |  |
Interest payment in connection with conversions |  |  |  |  |  |  | 3,918 |  |  |  | 234 |
Loss (Income) in connection with conversions |  |  |  |  |  |  | (1,643 | ) |  |  | 245 |
Total |  | $ | (7,130 | ) |  | $ | 47,079 |  |  | $ | 7,425 |
Notes 2022 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized related to the 2022 Notes:
(U.S. Dollars in thousands) |  | Year Ended December 31, 2017 |
Contractual interest expense |  | $ | 55 |
Debt premium amortization |  |  | (46 | )
Loss on extinguishment |  |  | 1,325 |
Total |  | $ | 1,334 |

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