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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aggregate Intrinsic Value      
Share price (in usd per share) $ 182.94    
Restricted stock units      
Number of Shares Outstanding      
Outstanding, beginning balance (in shares) 3,588 4,263 4,352
Granted (in shares) 1,301 1,550 2,112
Vested (in shares) (1,979) (2,085) (1,707)
Canceled (in shares) (124) (140) (494)
Outstanding, ending balance (in shares) 2,786 3,588 4,263
Number of shares outstanding, expected to vest (in shares) 2,786    
Weighted Average Fair Value per Share at Grant Date      
Outstanding, beginning balance (in usd per share) $ 27.61 $ 7.19 $ 3.52
Granted (in usd per share) 179.88 55.66 11.50
Vested (in usd per share) 20.47 7.26 3.87
Canceled (in usd per share) 88.50 19.47 4.81
Outstanding, ending balance (in usd per share) 100.73 $ 27.61 $ 7.19
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 100.73    
Weighted-Average Remaining Contractual Term      
Outstanding 1 year 2 months 12 days    
Expected to vest 1 year 2 months 12 days    
Aggregate Intrinsic Value      
Vested $ 364,665 $ 125,578 $ 27,156
Outstanding 509,864    
Aggregate intrinsic value, expected to vest $ 509,864