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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2018
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, 2018 (U.S. dollars in thousands):
| March 31, 2018
Outstanding at December 31, 2017 | $ | 1,126 |
Increase (decrease) attributed to: |  |
Customer loyalty net deferrals | 1,790 |
Customer loyalty redemptions | (1,445 | )
Outstanding at March 31, 2018 | $ | 1,471 |
The table above excludes liability for sales returns, as they are insignificant.

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