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REVENUE RECOGNITION (Tables)
12 Months Ended
Dec. 31, 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 years ended December 31, 2018 2019 (U.S. dollars in thousands):
Outstanding at December 31, 2017$1,126  
Increase (decrease) attributed to:
Customer loyalty net deferrals4,333  
Customer loyalty redemptions(4,380) 
Outstanding at December 31, 20181,079  
Increase (decrease) attributed to:
Customer loyalty net deferrals4,969  
Customer loyalty redemptions(5,093) 
Outstanding at December 31, 2019$955  
The table above excludes liability for sales returns, as they are insignificant.