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RELATED PARTY TRANSACTIONS - Key Management Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Related Party [Abstract]    
Salaries and other short-term employee benefits $ 2,240 $ 2,433
Post-employment benefits 30 29
Share-based compensation 3,176 4,915
Total compensation $ 5,446 $ 7,377