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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Aggregate Intrinsic Value  
Share price (in USD per share) $ 22.23
Restricted stock units  
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 4,352
Granted (in shares) | shares 1,997
Vested (in shares) | shares (1,317)
Canceled (in shares) | shares (461)
Outstanding, ending balance (in shares) | shares 4,571
Number of shares outstanding, expected to vest (in shares) | shares 4,571
Weighted Average Fair Value per Share at Grant Date  
Outstanding, beginning balance (in usd per share) $ 3.52
Granted (in usd per share) 10.86
Vested (in usd per share) 3.62
Canceled (in usd per share) 4.54
Outstanding, ending balance (in usd per share) 6.60
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 6.60
Weighted-Average Remaining Contractual Term  
Outstanding 1 year 3 months 18 days
Expected to vest 1 year 3 months 18 days
Aggregate Intrinsic Value  
Vested | $ $ 18,853
Outstanding | $ 101,604
Aggregate intrinsic value, expected to vest | $ $ 101,604