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REVENUE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Actual sales returns rate | 2.00% | 2.00%
Cash payments received toward unshipped products | $ 4.5 |
Revenue recognized that was included in deferred revenue in prior year | $ 2.4 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Sales return policy term | 14 days |
Historical sales returns rate | 1.00% |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Sales return policy term | 1 year |
Historical sales returns rate | 5.00% |

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