CONVERTIBLE NOTES (Tables)

12 Months Ended

Dec. 31, 2021

Notes 2021 and 2024

Schedule of Fair Value Assumptions

The following parameters were used:

	2021 Notes		2024 Notes
Stock price (USD)	1.34		1.34
Expected term	0.23		3.03
Risk free rate	0.05	%	0.44	%
Volatility	78.95	%	91.35	%
Yield	7.87	%	7.66	%

2021 Notes

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)	2019		2020		2021
Contractual interest expense	$	4,344	$	4,344	$	2,855
Debt discount amortization		2,991		3,470		2,575
Loss from extinguishment						831
Other expenses				1,300
Total	$	7,335	$	9,114	$	6,261

2024 Notes

Schedule of Fair Value Assumptions

	2024 Notes
Stock price (USD)	0.83
Expected term	2.67
Risk free rate	0.90	%
Volatility	92.79	%
Yield	10.31	%

Schedule of Interest Expense Recognized

The following table sets forth total interest expense recognized related to the 2024 Notes:

(U.S. dollars in thousands)	December 31, 2021
Contractual interest expense	$	767
Amortization of debt issuance costs and debt discount		97
Total	$	864