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FINANCE LEASE OBLIGATIONS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Less: Future interest charges $ (71) $ (150) $ (197)
Present value of lease payments 1,819 2,349 2,812
Less: current portion (950) (1,116) (1,435)
Non-current portion 869 1,233 1,377
Not later than one year [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Contractual maturities 943 1,204 1,527
Later Than One Year And Not Later Than Five Years [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Contractual maturities $ 947 $ 1,295 $ 1,482