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Related Parties - Transactions and Balances (Tables)
12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Schedule of balances with related parties
   December 31, 
   2020   2019 
   (U.S. Dollars in thousands) 
Related party accrued liability   -    72 
Related party liability, refer to note 6   -    17,748 
Schedule of related parties transactions
   Year ended December 31, 
   2020   2019   2018 
   (U.S. Dollars in thousands) 
Research and development – see c and d below   355    154    542 
General and administrative – See c, e and f below   (167)   5,824    892