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SUPPLEMENTARY CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net change in non-cash working capital items:      
Deferred revenues $ 573
Accounts payable and accrued liabilities 2,329 (136) 708
Prepaid expenses and other assets 981 (1,672) (115)
Amounts receivable 543 (1,585) (355)
Taxes payable (358) (292) (14)
Amounts due to related parties (44) 1 42
Taxes recoverable 1,017 (2,828) (1,323)
Inventory (42) (2,565) (41)
Net change in non-cash working capital items $ 4,999 $ (9,077) $ (1,098)