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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of Shares Outstanding    
Outstanding, beginning balance (in shares) | shares   2,532,000
Granted (in shares) | shares 0 0
Exercised (in shares) | shares   (225,000)
Canceled (in shares) | shares   (1,000)
Outstanding, ending balance (in shares) | shares 2,306,000 2,306,000
Shares outstanding, vested and expected to vest (in shares) | shares 2,306,000 2,306,000
Shares outstanding, exercisable (in shares) | shares 2,296,000 2,296,000
Weighted- Average Exercise Price per Share    
Outstanding, beginning balance (in usd per share)   $ 1.96
Granted (in usd per share)   0
Exercised (in usd per share)   1.98
Canceled (in usd per share)   0.83
Outstanding, ending balance (in usd per share) $ 1.96 1.96
Weighted-average exercise price, vested and expected (in usd per share) 1.96 1.96
Weighted-average exercise price, exercisable (in usd per share) $ 1.95 $ 1.95
Weighted-Average Remaining Contractual Term    
Outstanding   3 years
Vested and expected to vest   3 years
Exercisable   3 years
Aggregate Intrinsic Value    
Exercised | $   $ 32,144
Outstanding | $ $ 341,368 341,368
Vested and expected to vest | $ 341,368 341,368
Exercisable | $ $ 339,784 $ 339,784
Share price (in usd per share) $ 149.97 $ 149.97