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STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2021
Jun. 30, 2021
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized     2 years 10 months 9 days
Stock option expense     $ 108,964
Shares (in thousands)      
Unvested — Beginning balance (in shares) 2,588,000   2,434,000
Granted (in shares)     565,000
Vested (in shares)     (303,000)
Forfeited (in shares)     (108,000)
Unvested — Ending balance (in shares)   2,588,000 2,588,000
Weighted-Average Grant Date Fair Value      
Unvested — Beginning balance (in usd per share) $ 51.76   $ 32.49
Vested (in usd per share)     31.85
Forfeited (in usd per share)     33.10
Unvested — Ending balance (in usd per share)   $ 51.76 $ 51.76
Granted (in usd per share)   $ 120.60  
Subsequent Event      
Shares (in thousands)      
Granted (in shares) 73,310    
Weighted-Average Grant Date Fair Value      
Compensation not yet recognized, awards other than options $ 13,200