Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Narrative (Details)

v3.10.0.1
REVENUE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]      
Sales return rate   2.00% 2.00%
Increase in deferred revenue from cash payments received $ 2.3    
Decrease in deferred revenue, revenue recognized $ 1.7    
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   7.00%