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Cash, Cash Equivalents and Restricted Cash (Tables)
12 Months Ended
Dec. 31, 2020
Cash Equivalents And Restricted Cash [Abstract]  
Schedule of reconciliation of cash, cash equivalents and restricted cash
   December 31, 
   2020   2019 
   (U.S. Dollars
in thousands)
 
Cash and cash equivalents   213,468    8,072 
Restricted bank deposit   316    145 
Total cash, cash equivalents and restricted cash shown in the statement of cash flows   213,784    8,217