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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability
The following table presents changes in these contract liability balances for the nine-month period ended September 30, 2019 (U.S. dollars in thousands):
Outstanding at December 31, 2018$1,079  
Increase (decrease) attributed to: 
Customer loyalty net deferrals 3,976  
Customer loyalty redemptions (3,999) 
Outstanding at September 30, 2019$1,056  
The table above excludes liability for sales returns, as they are insignificant.