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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Aggregate Intrinsic Value  
Share price (in usd per share) $ 149.97
Restricted stock units  
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 3,588
Granted (in shares) | shares 957
Vested (in shares) | shares (1,525)
Canceled (in shares) | shares (95)
Outstanding, ending balance (in shares) | shares 2,925
Number of shares outstanding, expected to vest (in shares) | shares 2,925
Weighted Average Fair Value per Share at Grant Date  
Outstanding, beginning balance (in usd per share) $ 27.61
Granted (in usd per share) 160.39
Vested (in usd per share) 16.82
Canceled (in usd per share) 78.93
Outstanding, ending balance (in usd per share) 74.99
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 74.99
Weighted-Average Remaining Contractual Term  
Outstanding 1 year 1 month 6 days
Expected to vest 1 year 1 month 6 days
Aggregate Intrinsic Value  
Vested | $ $ 263,402
Outstanding | $ 438,709
Aggregate intrinsic value, expected to vest | $ $ 438,709