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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Aggregate Intrinsic Value  
Share price (in usd per share) $ 162.16
Restricted stock units  
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 3,588
Granted (in shares) | shares 168
Vested (in shares) | shares (847)
Canceled (in shares) | shares (12)
Outstanding, ending balance (in shares) | shares 2,897
Number of shares outstanding, expected to vest (in shares) | shares 2,897
Weighted Average Fair Value per Share at Grant Date  
Outstanding, beginning balance (in usd per share) $ 27.61
Granted (in usd per share) 183.78
Vested (in usd per share) 17.49
Canceled (in usd per share) 88.18
Outstanding, ending balance (in usd per share) 39.37
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 39.37
Weighted-Average Remaining Contractual Term  
Outstanding 1 year 2 months 1 day
Expected to vest 1 year 2 months 1 day
Aggregate Intrinsic Value  
Vested | $ $ 163,030
Outstanding | $ 469,766
Aggregate intrinsic value, expected to vest | $ $ 469,718