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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares Outstanding      
Outstanding, beginning balance (in shares) 4,097 6,772 8,426
Granted (in shares) 11 43 213
Exercised (in shares) (1,494) (2,616) (1,346)
Canceled (in shares) (82) (102) (521)
Outstanding, ending balance (in shares) 2,532 4,097 6,772
Shares outstanding, vested and expected to vest (in shares) 2,532    
Shares outstanding, exercisable (in shares) 2,089    
Weighted- Average Exercise Price per Share      
Outstanding, beginning balance (in usd per share) $ 2.18 $ 1.76 $ 1.77
Granted (in usd per share) 64.17 14.58 4.43
Exercised (in usd per share) 2.74 1.22 1.75
Canceled (in usd per share) 6.94 4.07 2.94
Outstanding, ending balance (in usd per share) 1.96 $ 2.18 $ 1.76
Weighted-average exercise price, vested and expected (in usd per share) 1.96    
Weighted-average exercise price, exercisable (in usd per share) $ 1.95    
Weighted-Average Remaining Contractual Term      
Outstanding 3 years 8 months 12 days    
Vested and expected to vest 3 years 8 months 12 days    
Exercisable 3 years 8 months 12 days    
Aggregate Intrinsic Value      
Exercised $ 114,089 $ 31,093 $ 5,096
Outstanding 439,268    
Vested and expected to vest 439,268    
Exercisable $ 362,526    
Share price (in usd per share) $ 175.47