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Common Shares, Unrecognized compensation (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense related to stock options $ 12  
Weighted average compensation recognition period 1 year 2 months 12 days 1 year 2 months 12 days
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense related to unvested awards $ 838  
Weighted average compensation recognition period 1 year 6 months