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Revenue Recognition (Tables)
3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability The following table presents changes in these contract liability balances for the three-month period ended March 31, 2021 (U.S. dollars in thousands):
Outstanding at January 1, 2021$983 
Increase (decrease) attributed to: 
Customer loyalty net deferrals 258 
Customer loyalty redemptions (257)
Outstanding at March 31, 2021$984 
The table above excludes liability for sales returns, as they are not significant.