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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 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 six-month period ended June 30, 2019 (U.S. dollars in thousands):
Outstanding at December 31, 2018 | $ | 1,079 |
Increase (decrease) attributed to: |  |
Customer loyalty net deferrals | 3,041 |
Customer loyalty redemptions | (3,011 | )
Outstanding at June 30, 2019 | $ | 1,109 |
The table above excludes liability for sales returns, as they are insignificant.

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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