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SUBSEQUENT EVENTS - (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 14, 2020
CAD ($)
Jul. 31, 2020
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2017
CAD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
CAD ($)
shares
Dec. 31, 2019
shares
Subsequent Event [Line Items]                
Common stock, shares, issued (in shares) | shares             120,534,705 100,735,889
Proceeds from issuance of shares         $ 27,862 $ 8,853    
Price Of Aggregate Principal Amount Redeemed             1043000000.00%  
Convertible debentures             $ 20,860  
At the Market Program | Subsequent Event                
Subsequent Event [Line Items]                
Common stock, shares, issued (in shares) | shares   5,000,000.00            
Average price (in dollars per share) | $ / shares   $ 1.75            
Proceeds from issuance of shares   $ 8,530            
Convertible Debentures | Convertible Debt                
Subsequent Event [Line Items]                
Principal amount redeemed     $ 870 $ 1,130        
Convertible Debentures | Convertible Debt | Subsequent Event                
Subsequent Event [Line Items]                
Principal amount redeemed $ 10,430