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Weighted average basic and diluted number of common shares outstanding
9 Months Ended
Sep. 30, 2018
Weighted average basic and diluted number of common shares outstanding [abstract]  
Weighted average basic and diluted number of common shares outstanding
11.   Weighted average basic and diluted number of common shares outstanding
 
 
 Three-month
 
 Three-month
 
 Nine-month
 
 Nine-month
 
 period ended
 
 period ended
 
 period ended
 
 period ended
 
 September 30,
 
 September 30,
 
 September 30,
 
 September 30,
 
 2018
 
 2017
 
 2018
 
 2017
 
 
 
 
 
 
 
 
Basic weighted average number of shares
                                                                            43,019,794
 
                                                                             40,137,013
 
                                                                            42,424,147
 
                                                                           39,862,124
Effect of dilutive stock options and warrants
                                                                                                          -
 
                                                                                                          -
 
                                                                                                          -
 
                                                                                                         -
Diluted weighted average number of shares
                                                                            43,019,794
 
                                                                             40,137,013
 
                                                                            42,424,147
 
                                                                           39,862,124


Diluted weighted average number of common shares for the three-month periods ended September 30, 2018 excludes 3,119,993 anti-dilutive stock options (2017: 2,316,264) and 4,091,623 anti-dilutive warrants (2017: 5,859,843).and nine-month periods ended September 30, 2018 excludes 3,119,993 anti-dilutive stock options (2017: 2,316,264) and 4,091,623 anti-dilutive warrants (2017: 5,859,843).