6. NET LOSS PER SHARE

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) per share for the three and nine months ended September 30, 2021 and September 30, 2020 is computed by dividing net income (loss) by the sum of the weighted average number of shares of common stock and the dilutive potential common stock equivalents then outstanding. Potential common stock equivalents consist of stock options, warrants, non-vested restricted stock, preferred shares convertible into common stock and, pre-funded warrants. Since there is a net loss attributable to common stockholders for the three and nine months ended September 30, 2021 and September 30, 2020, the inclusion of common stock equivalents in the computation for that period would be antidilutive.

The following potentially dilutive securities have been excluded from the computation of diluted net income (loss) per share since their inclusion would be antidilutive:

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