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STOCK-BASED COMPENSATION - Schedule of Weighted-Average Assumptions for Options and ESPP Subscriptions Granted Granted (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
 Option Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 0.90% 0.30% 0.80% 0.30%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 33.50% 33.40% 33.50% 34.20%
Expected term 5 years 3 months 18 days 5 years 2 months 12 days 5 years 5 years 1 month 6 days
Fair value, per option (in dollars per share) $ 34.38 $ 22.24 $ 28.78 $ 22.19
 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 0.10% 0.10% 0.10% 1.30%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 33.70% 37.50% 36.60% 33.10%
Expected term 8 months 12 days 8 months 12 days 7 months 6 days 7 months 6 days
Fair value, per option (in dollars per share) $ 29.85 $ 21.79 $ 23.07 $ 16.61