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STOCK-BASED COMPENSATION - Schedule of Weighted-Average Assumptions for Options and ESPP Subscriptions Granted Granted (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
 Option Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 0.80% 0.30% 0.80% 0.30%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 33.50% 33.50% 33.50% 33.40%
Expected term 5 years 5 years 5 years 5 years
Fair value, per option (in dollars per share) $ 28.60 $ 21.58 $ 28.54 $ 21.61
 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 0.00% 0.10% 0.10% 1.40%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent) 32.30% 37.50% 36.80% 32.60%
Expected term 7 months 6 days 7 months 6 days 7 months 6 days 7 months 6 days
Fair value, per option (in dollars per share) $ 26.03 $ 18.42 $ 22.65 $ 16.06