Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following table presents changes in these contract liability balances for the six-month period ended June 30, 2020 (U.S. dollars in thousands):

Outstanding at December 31, 2019	$	955
Increase (decrease) attributed to:
Customer loyalty net deferrals	3,779
Customer loyalty redemptions	(3,830)
Outstanding at June 30, 2020	$	904

The table above excludes liability for sales returns, as they are insignificant.