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FINANCIAL INSTRUMENTS - (Gain)/loss on fair value of financial instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Aug. 03, 2016
Disclosure of detailed information about financial instruments [line items]      
Loss on fair value of 5% Convertible Debentures $ 0 $ 317  
Gain on fair value of warrants 0 (86)  
Gain on warrant exercise 0 (193)  
Gain on fair value of 7% Convertible Debentures embedded derivative (6,786) (2,095)  
(Gain)/loss on fair value of financial instruments, net $ (6,786) $ (2,057)  
5% Convertible Debentures      
Disclosure of detailed information about financial instruments [line items]      
Borrowings, interest rate 5.00% 5.00%  
7% Convertible Debentures      
Disclosure of detailed information about financial instruments [line items]      
Borrowings, interest rate 7.00%   7.00%