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Common Shares, Unrecognized compensation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense related to stock options $ 10
Weighted average compensation recognition period 11 months 27 days
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense related to unvested awards $ 649
Weighted average compensation recognition period 1 year 3 months 18 days