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Common Shares, Warrants (Details) - Warrants [Member] - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Warrants outstanding, beginning of period (in shares) 6,514,625  
Warrants outstanding, end of period (in shares) 6,514,625 6,514,625
Weighted average exercise price of warrants outstanding (in dollars per share) $ 1.92 $ 1.92
Weighted average remaining life, warrants outstanding 1 year 1 month 6 days 1 year 7 months 6 days