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STOCK-BASED COMPENSATION - Weighted-Average Assumptions for Options and ESPP Subscriptions Granted (Details) - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
 Option Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average risk-free interest rate 1.90% 0.60%
Expected dividend yield 0.00% 0.00%
Expected volatility (as a percent) 33.50% 33.40%
Expected term (years) 5 years 3 months 18 days 5 years 2 months 12 days
Fair value, per option (in dollars per share) $ 35.66 $ 26.28
 ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average risk-free interest rate 0.20% 0.10%
Expected dividend yield 0.00% 0.00%
Expected volatility (as a percent) 32.20% 37.50%
Expected term (years) 7 months 6 days 7 months 6 days
Fair value, per option (in dollars per share) $ 29.52 $ 22.14