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RELATED PARTY TRANSACTIONS (Tables)
12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
 
 
Year ended December 31,
 
(U.S. dollars in thousands)
 
 
2016
 
 
 
2017
 
 
 
2018
 
Compensation (including share based compensation) to the non-executive directors
 
$
560
 
 
$
499
 
 
$
467