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SHARE-BASED COMPENSATION - Option Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Number of Shares    
Outstanding, beginning balance (in shares) | shares 10.4  
Granted (in shares) | shares 0.0  
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares) | shares (2.3)  
Forfeited, expired or canceled (in shares) | shares (0.7)  
Outstanding, ending balance (in shares) | shares 7.4 10.4
Weighted-Average Exercise Price    
Outstanding, beginning balance, weighted-average exercise price (in dollars per share) | $ / shares $ 2.39  
Granted, weighted-average exercise price (in dollars per share) | $ / shares 10.82  
Exercised, weighted-average exercise price (in dollars per share) | $ / shares 1.83  
Forfeited, expired and canceled, weighted-average exercise price (in dollars per share) | $ / shares 4.62  
Outstanding, ending balance, weighted-average exercise price (in dollars per share) | $ / shares $ 2.44 $ 2.39
Outstanding, weighted-average remaining contractual term (in years) 7 years 2 months 19 days 7 years 9 months
Exercisable, weighted-average remaining contractual term (in years) 7 years 2 months 19 days 7 years 9 months
Outstanding, aggregate intrinsic value | $ $ 61.8 $ 137.7
Exercised, aggregate intrinsic value | $ 23.3  
Exercisable, aggregate intrinsic value | $ $ 61.8 $ 137.7