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SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Investing and Financing Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash Flow Statement [Abstract]    
Marketable securities received for sale of exploration and evaluation assets (note 6) $ 1,751 $ 992
Transfer of share-based payment reserve upon exercise of stock options (2,864) (1,339)
Acquisition of Chinchillas mineral property (note 3) $ 0 $ 28,839