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DEIVATIVE FINANCIAL INSTRUMENTS - Fair value measurements for financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Oct. 09, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 03, 2016
Disclosure of financial liabilities [line items]          
Financial liabilities $ 5,025   $ 5,819 $ 4,177  
7% Convertible Debentures          
Disclosure of financial liabilities [line items]          
Borrowings, interest rate 7.00% 7.00%     7.00%
Carrying value          
Disclosure of financial liabilities [line items]          
Financial liabilities $ 5,025   5,819    
Carrying value | Level 3 | Convertible Debentures | 7% Convertible Debentures          
Disclosure of financial liabilities [line items]          
Financial liabilities 2,643   5,608    
Carrying value | Level 2 | Non-hedge derivative contracts          
Disclosure of financial liabilities [line items]          
Financial liabilities 2,382   211    
Fair value          
Disclosure of financial liabilities [line items]          
Financial liabilities 5,025   5,819    
Fair value | Level 3 | Convertible Debentures | 7% Convertible Debentures          
Disclosure of financial liabilities [line items]          
Financial liabilities 2,643   5,608    
Fair value | Level 2 | Non-hedge derivative contracts          
Disclosure of financial liabilities [line items]          
Financial liabilities $ 2,382   $ 211