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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Aggregate Intrinsic Value  
Share price (in usd per share) $ 183.63
Restricted stock units  
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 3,588
Granted (in shares) | shares 571
Vested (in shares) | shares (1,254)
Canceled (in shares) | shares (33)
Outstanding, ending balance (in shares) | shares 2,872
Number of shares outstanding, expected to vest (in shares) | shares 2,872
Weighted Average Fair Value per Share at Grant Date  
Outstanding, beginning balance (in usd per share) $ 27.61
Granted (in usd per share) 149.01
Vested (in usd per share) 15.65
Canceled (in usd per share) 69.71
Outstanding, ending balance (in usd per share) 56.66
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 56.66
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 | $ $ 216,814
Outstanding | $ 527,435
Aggregate intrinsic value, expected to vest | $ $ 527,435