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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME/(LOSS) (Parenthetical)
Dec. 31, 2017
7% Convertible Debentures  
Disclosure of detailed information about borrowings [line items]  
Borrowings, interest rate 7.00%
5% Convertible Debentures  
Disclosure of detailed information about borrowings [line items]  
Borrowings, interest rate 5.00%