CONVERTIBLE NOTES (Tables)

12 Months Ended

Dec. 31, 2020

Notes 2018 [Member]

Schedule of Interest Expense Recognized

The following table sets forth total interest expense recognized for the years ended December 31, 2018 related to the 2018 Notes:

	December 31,
(U.S. dollars in thousands)	2018
Contractual interest expense	$	139
Amortization of debt issuance costs and debt discount		15
Gain from early redemption		(32)
Total	$	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)	2018		2019		2020
Contractual interest expense	$	4,359	$	4,344	$	4,344
Debt discount amortization		2,587		2,991		3,470
Interest payment in connection with conversions		234
Loss in connection with conversions		245
Other expenses						1,300
Total	$	7,425	$	7,335	$	9,114