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Weighted average basic and diluted number of common shares outstanding
12 Months Ended
Dec. 31, 2017
Weighted average basic and diluted number of common shares outstanding [abstract]  
Weighted average basic and diluted number of common shares outstanding
14.   Weighted average basic and diluted number of common shares outstanding
 
 
Year ended
   
Year ended
 
 
 
December 31,
   
December 31,
 
 
 
2017
   
2016
 
 
           
Basic weighted average number of shares
   
40,194,660
     
34,526,435
 
Effect of dilutive stock options and warrants
   
-
     
-
 
Diluted weighted average number of shares
   
40,194,660
     
34,526,435
 

Diluted weighted average number of common shares for the year ended December 31, 2017 excludes 2,316,264 (2016: 1,770,765) anti-dilutive stock options and 5,167,391 (2016: 6,862,508) anti-dilutive warrants.