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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares Outstanding      
Outstanding, beginning balance (in shares) 2,532,000 4,097,000 6,772,000
Granted (in shares) 0 11,000 43,000
Exercised (in shares) (267,000) (1,494,000) (2,616,000)
Canceled (in shares) (1,000) (82,000) (102,000)
Outstanding, ending balance (in shares) 2,264,000 2,532,000 4,097,000
Shares outstanding, vested and expected to vest (in shares) 2,264,000    
Shares outstanding, exercisable (in shares) 2,262,000    
Weighted- Average Exercise Price per Share      
Outstanding, beginning balance (in usd per share) $ 1.96 $ 2.18 $ 1.76
Granted (in usd per share) 0 64.17 14.58
Exercised (in usd per share) 2.44 2.74 1.22
Canceled (in usd per share) 0.83 6.94 4.07
Outstanding, ending balance (in usd per share) 1.90 $ 1.96 $ 2.18
Weighted-average exercise price, vested and expected (in usd per share) 1.90    
Weighted-average exercise price, exercisable (in usd per share) $ 1.90    
Weighted-Average Remaining Contractual Term      
Outstanding 2 years 9 months 18 days    
Vested and expected to vest 2 years 9 months 18 days    
Exercisable 2 years 9 months 18 days    
Aggregate Intrinsic Value      
Exercised $ 42,091 $ 114,089 $ 31,093
Outstanding 409,834    
Vested and expected to vest 409,834    
Exercisable $ 409,550    
Share price (in usd per share) $ 182.94