CONVERTIBLE NOTES (Tables)

12 Months Ended

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