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SHARE-BASED COMPENSATION - Summary of Stock options activity (Details) - Stock options
$ / shares in Units, shares in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Number of units  
Granted | shares 59
Outstanding at the end | shares 59
Weighted Average Exercise Price  
Granted (in dollars per share) $ 13.63
Outstanding at the end 13.63
Weighted Average Fair Value  
Granted (in dollars per share) 7.69
Outstanding at the end $ 7.69
Granted (in years) 6 years 10 months 10 days
Outstanding at the end (in years) 6 years 10 months 10 days
Granted (in dollars) $ 102
Outstanding at the end (in dollars) | $ $ 102