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SHARE INCENTIVE PLAN - Share-based compensation expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SHARE INCENTIVE PLAN      
Share-based compensation recognized $ 4,869 $ 3,990 $ 0
Total unrecognized compensation expenses relating to unvested share options $ 3,376    
Weighted average period 2 years 6 months 4 days