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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 2,532
Granted (in shares) | shares 0
Exercised (in shares) | shares (55)
Canceled (in shares) | shares (1)
Outstanding, ending balance (in shares) | shares 2,476
Shares outstanding, vested and expected to vest (in shares) | shares 2,476
Shares outstanding, exercisable (in shares) | shares 2,248
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) 3.91
Canceled (in usd per share) 0.83
Outstanding, ending balance (in usd per share) 1.92
Weighted-average exercise price, vested and expected (in usd per share) 1.92
Weighted-average exercise price, exercisable (in usd per share) $ 1.92
Weighted-Average Remaining Contractual Term  
Outstanding 3 years 6 months
Vested and expected to vest 3 years 6 months
Exercisable 3 years 6 months
Aggregate Intrinsic Value  
Exercised | $ $ 9,882
Outstanding | $ 396,797
Vested and expected to vest | $ 396,797
Exercisable | $ $ 360,300
Share price (in usd per share) $ 162.16