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Common Shares (Warrants) (Details) - Warrants - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Warrants outstanding, beginning of period (in shares)     15,219,802 19,977,743  
Warrants expired (in shares)     (15,219,802) (4,757,941)  
Issued (in shares) 6,514,625 6,514,625      
Warrants outstanding, end of period (in shares)   6,514,625   15,219,802 19,977,743
Weighted average exercise price of warrants outstanding (in dollars per share) $ 1.92 $ 1.92   $ 5.00 $ 4.63
Weighted average exercise price per share of warrants issued (in dollars per share)   $ 1.92      
Weighted average remaining life, warrants outstanding   2 years 7 months 6 days   9 months 18 days 1 year 7 months 6 days
Weighted average remaining life, warrants issued   2 years 7 months 6 days