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SUPPLEMENTARY CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net change in non-cash working capital items:      
Deferred revenues $ 0 $ (573) $ 573
Accounts payable and accrued liabilities (2,877) (941) 2,329
Prepaid expenses and other assets (157) 287 981
Amounts receivable 1,211 2,615 543
Taxes payable (39) (121) (358)
Amounts due to related parties 1 6 (44)
Taxes recoverable 440 (193) 1,017
Other liabilities (178) (100) 0
Inventory 4,150 3,182 (42)
Net change in non-cash working capital items $ 2,551 $ 4,162 $ 4,999