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Weighted average basic and diluted number of common shares outstanding | 9 Months Ended
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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).

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