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REVENUE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Sales return rate | 2.00% | 2.00%
Decrease in deferred revenue, revenue recognized | $ 5.0 |
Increase in deferred revenue from cash payments received | $ 2.0 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Sales returns policy term | 14 days |
Historical sales returns rate | 1.00% |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Sales returns policy term | 1 year |
Historical sales returns rate | 5.00% |

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