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CONVERTIBLE NOTES (Tables) | 12 Months Ended
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Dec. 31, 2017
Seven Point Five Percentage Convertible Notes [Member] |
Fair Value Measurements, Recurring and Nonrecurring | The Company prepared a valuation of the fair value of the 2016 Notes (a Level 3 valuation) for the issuance dates. The value of the 2016 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 2017 Notes (a Level 3 valuation) for the issuance date. The value of the 2017 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 2013 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized for the years ended December 31, 2015, 2016 and 2017 related to the 2013 Notes:
|  | Year ended December 31, |
(U.S. Dollars in thousands) |  | 2015 |  | 2016 |  | 2017 |
Contractual interest expense |  | $ | 3,105 |  | $ | 2,943 |  | $ | 501 |
Amortization of debt issuance costs and debt discount |  |  | 444 |  |  | 421 |  |  | 71 |
Total |  | $ | 3,549 |  | $ | 3,364 |  | $ | 572 |
Notes 2016 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized related to the 2016 Notes:
|  | Year Ended December 31, |
|  | 2016 |  | 2017 |
(U.S. Dollars in thousands) |  |  |  |  |  |  |
Contractual interest expense |  | $ | 313 |  | $ | 4,434 |
Debt discount amortization |  |  | 147 |  |  | 2,309 |
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 |
Income in connection with conversions |  |  |  |  |  | (1,643) |
Total |  | $ | (7,130) |  | $ | 47,079 |
Notes 2017 [Member] |
Schedule of Interest Expense Recognized | The following table sets forth total interest expense recognized related to the 2017 Notes:
|  | Year Ended December 31, 2017 |
(U.S. Dollars in thousands) |  |  |  |
Contractual interest expense |  | $ | 55 |
Debt premium amortization |  |  | (46) |
Loss on extinguishment |  |  | 1,325 |
Total |  | $ | 1,334 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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