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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, 2019
USD ($)
$ / shares
shares
Weighted-Average Remaining Contractual Term  
Outstanding 1 year 6 months
Aggregate Intrinsic Value  
Share price (in USD per share) $ 9.23
Restricted stock units  
Number of Shares Outstanding  
Outstanding, beginning balance (in shares) | shares 4,352
Granted (in shares) | shares 1,114
Vested (in shares) | shares (716)
Canceled (in shares) | shares (216)
Outstanding, ending balance (in shares) | shares 4,534
Number of shares outstanding, expected to vest (in shares) | shares 4,532
Weighted Average Fair Value per Share at Grant Date  
Outstanding, beginning balance (in usd per share) $ 3.52
Granted (in usd per share) 8.12
Vested (in usd per share) 3.70
Canceled (in usd per share) 2.02
Outstanding, ending balance (in usd per share) 4.70
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 4.70
Weighted-Average Remaining Contractual Term  
Expected to vest 1 year 6 months
Aggregate Intrinsic Value  
Vested | $ $ 6,255
Outstanding | $ 41,845
Expected to vest | $ $ 41,835