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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Number of Shares Outstanding    
Outstanding, beginning balance (in shares) | shares   2,532
Granted (in shares) | shares 0 0
Exercised (in shares) | shares   (199)
Canceled (in shares) | shares   (1)
Outstanding, ending balance (in shares) | shares 2,332 2,332
Shares outstanding, vested and expected to vest (in shares) | shares 2,332 2,332
Shares outstanding, exercisable (in shares) | shares 2,231 2,231
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)   2.01
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) $ 1.97 $ 1.97
Weighted-Average Remaining Contractual Term    
Outstanding   3 years 3 months 18 days
Vested and expected to vest   3 years 3 months 18 days
Exercisable   3 years 3 months 18 days
Aggregate Intrinsic Value    
Exercised | $   $ 27,668
Outstanding | $ $ 423,555 423,555
Vested and expected to vest | $ 423,555 423,555
Exercisable | $ $ 405,325 $ 405,325
Share price (in usd per share) $ 183.63 $ 183.63