Basic net income (loss) per share is computed by dividing net income (loss) attributable to common shareholders by the weighted average number of common shares outstanding. Diluted net income (loss) per share is computed by dividing net income (loss) attributable to common shareholders by the weighted average number of common shares outstanding plus the number of common shares that would be issued assuming exercise or conversion of all potentially dilutive common shares. Potentially dilutive securities are excluded from the calculation when their effect would be antidilutive. For the year ended December 31, 2018 all potentially dilutive securities have been excluded from the diluted share calculations as they were anti-dilutive as a result of the net loss incurred. Accordingly, basic shares equal diluted shares for the year ended December 31, 2018.

Potentially dilutive securities were comprised of the following:

The following table sets forth the composition of the weighted average shares (denominator) used in the basic and dilutive earnings per share computation for the years ended December 31, 2019 and 2018.