December 31, 2017 | December 31, 2016 | December 31, 2015 | ||||||||
General and administrative – salaries | $ | 240,000 | $ | 285,000 | $ | 578,887 | ||||
Directors’ fees | 55,000 | 55,000 | 42,137 | |||||||
Stock-based compensation | 115,800 | 826,307 | 42,216 | |||||||
$ | 410,800 | $ | 1,166,307 | $ | 663,240 |