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FINANCIAL INSTRUMENTS - Fair value measurements for financial instruments (Details) - 7% Convertible Debentures - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Aug. 03, 2016
Disclosure of financial liabilities [line items]      
Borrowings, interest rate 7.00%   7.00%
Carrying value | Level 3 | Convertible Debentures      
Disclosure of financial liabilities [line items]      
Financial Liabilities $ 5,608 $ 4,177  
Carrying value | Level 2 | Derivatives      
Disclosure of financial liabilities [line items]      
Financial Liabilities 211 0  
Fair value | Level 3 | Convertible Debentures      
Disclosure of financial liabilities [line items]      
Financial Liabilities 5,608 4,177  
Fair value | Level 2 | Derivatives      
Disclosure of financial liabilities [line items]      
Financial Liabilities $ 211 $ 0