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FINANCIAL INSTRUMENTS - Changes of financial liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
7% Convertible Debentures embedded derivative    
Disclosure of financial liabilities [line items]    
Financial liabilities, beginning balance $ 4,177  
Financial liabilities, ending balance 5,608 $ 4,177
7% Convertible Debentures    
Disclosure of financial liabilities [line items]    
Loss on fair value of 7% Convertible Debentures embedded derivative $ 1,431 $ (6,800)