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SUMMARY OF ACCOUNTING POLICIES - Financial Instruments (Details)
Dec. 31, 2018
Dec. 31, 2017
Aug. 03, 2016
5% Convertible Debentures      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 5.00% 5.00%  
7% Convertible Debentures      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 7.00%   7.00%