CONVERTIBLE NOTES (Tables)

12 Months Ended

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