Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity and Capital Stock - o/s RSUs (Details)

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Shareholders' Equity and Capital Stock - o/s RSUs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
RSUs      
Number of unvested units 1,296,227 1,296,227 1,175,952
Remaining life (years)   10 months 21 days  
Aggregate Intrinsic Value   $ 1,050  
August 22. 2018      
RSUs      
Number of unvested units 239,423 239,423  
Remaining life (years)   1 year 10 months 21 days  
Aggregate Intrinsic Value   $ 194  
December 16, 2016      
RSUs      
Number of unvested units 570,578 570,578  
Remaining life (years)   2 months 16 days  
Aggregate Intrinsic Value   $ 462  
December 15, 2017      
RSUs      
Number of unvested units 486,226 486,226  
Remaining life (years) 1 year 2 months 16 days    
Aggregate Intrinsic Value $ 394