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SHARE-BASED COMPENSATION - Restricted Stock Units, Activity (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares Outstanding      
Outstanding, beginning of period (in shares) 0    
Granted (in shares) 1,877,000 0 0
Vested (in shares) 0 0  
Forfeited (in shares) (80,000)    
Outstanding, end of period (in shares) 1,797,000 0  
Vested and expected to vest (in shares) 1,219,000    
Weighted Average Grant Date Fair Value (per Share)      
Outstanding (in dollars per share) $ 0.00    
Granted (in dollars per share) 7.49    
Vested (in dollars per share) 0.00    
Forfeited (in dollars per share) 7.46    
Outstanding (in dollars per share) 7.49 $ 0.00  
Vested and expected to vest (in dollars per share) $ 7.49    
Weighted Average Life Remaining (Years)      
Outstanding, December 31, 2018 2 years    
Vested and expected to vest, December 31, 2018 1 year 10 months    
Aggregate Intrinsic Value (in thousands)      
Outstanding, December 31, 2018 $ 9,254    
Vested and expected to vest, December 31, 2018 $ 6,278