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EQUITY-BASED COMPENSATION - Employee Stock Purchase Plan (ESPP) (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
offering period 3 years
ESPP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
offering period 4 years
Issue price (percentage) 95.00%
Maximum annual employees contribution $ 15,000
Cash received for shares issued $ 56,000
Shares issued | shares 5,667
Minimum | ESPP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Employee service period 1 year