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STOCK-BASED COMPENSATION Summary of Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted-Average Remaining Contractual Term      
Outstanding 1 year 5 months    
Aggregate Intrinsic Value      
Share Price $ 4.73    
Restricted stock units      
Number of Shares Outstanding      
Outstanding, beginning balance (in shares) 3,505 606 1,313
Granted (in shares) 3,152 5,418 54
Vested (in shares) (1,399) (885) (464)
Canceled (in shares) (906) (1,634) (297)
Outstanding, ending balance (in shares) 4,352 3,505 606
Number of shares outstanding, expected to vest (in shares) 4,351    
Weighted Average Fair Value per Share at Grant Date      
Outstanding, beginning balance (in usd per share) $ 2.03 $ 9.33 $ 9.31
Granted (in usd per share) 4.45 1.46 1.99
Vested (in usd per share) 2.75 3.81 9.06
Canceled (in usd per share) 2.17 1.90 8.32
Outstanding, ending balance (in usd per share) 3.52 $ 2.03 $ 9.33
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) $ 3.52    
Weighted-Average Remaining Contractual Term      
Expected to vest 1 year 5 months    
Aggregate Intrinsic Value      
Vested $ 6,657 $ 932 $ 875
Outstanding 20,586    
Expected to vest $ 20,581