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SUPPLEMENTARY CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net change in non-cash working capital items:      
Deferred revenues $ (573) $ 573
Accounts payable and accrued liabilities (941) 2,329 (136)
Prepaid expenses and other assets 287 981 (1,672)
Amounts receivable 2,615 543 (1,585)
Taxes payable (121) (358) (292)
Amounts due to related parties 6 (44) 1
Taxes recoverable (193) 1,017 (2,828)
Other liabilities (100)
Inventory 3,182 (42) (2,565)
Net change in non-cash working capital items $ 4,162 $ 4,999 $ (9,077)