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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Aggregate Intrinsic Value  
Share price (in usd per share) $ 32.29
Restricted stock units  
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 4,263
Granted (in shares) | shares 552
Vested (in shares) | shares (951)
Canceled (in shares) | shares (34)
Outstanding, ending balance (in shares) | shares 3,830
Number of shares outstanding, expected to vest (in shares) | shares 3,830
Weighted Average Fair Value per Share at Grant Date  
Outstanding, beginning balance (in usd per share) $ 7.19
Granted (in usd per share) 31.34
Vested (in usd per share) 6.13
Canceled (in usd per share) 16.92
Outstanding, ending balance (in usd per share) 10.85
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 10.63
Weighted-Average Remaining Contractual Term  
Weighted- Average Remaining Contractual Term 1 year 3 months 18 days
Expected to vest 1 year 3 months 18 days
Aggregate Intrinsic Value  
Vested | $ $ 34,095
Outstanding | $ 123,672
Aggregate intrinsic value, expected to vest | $ $ 114,306