Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Narrative (Details)

v3.19.1
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%