| Number of Common Shares | Amount | |||||||
| Balance, December 31, 2015 | 14,445,168 | $ | 121,413,777 | |||||
| Shares issued upon exercise of stock options (12(c)) | 1,069,434 | 3,217,125 | ||||||
| Shares issued upon exercise of warrants (12(d)) | 17,806 | 69,443 | ||||||
| Balance, December 31, 2016 | 15,532,408 | $ | 124,700,345 | |||||
| Shares issued upon exercise of stock options (12(c)) | 207,950 | 869,703 | ||||||
| Shares issued upon exercise of warrants (12(d)) | 41,969 | 163,679 | ||||||
| Balance, December 31, 2017 | 15,782,327 | $ | 125,733,727 | |||||