| REVENUE RECOGNITION (Tables) | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| 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): 
 The table above excludes liability for sales returns, as they are insignificant. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
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- Definition Tabular disclosure of contract balances and changes in contract balances. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
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- References No definition available. 
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