Basic earnings (loss) per share is computed by dividing earnings (loss) by the weighted average number of common shares outstanding during each period. Diluted earnings (loss) per share is computed by dividing earnings (loss) by the total of the weighted average number of shares of common stock outstanding during each period, plus the effect of dilutive outstanding stock options and unvested restricted stock grants. Potentially dilutive securities are excluded from the computation of diluted earnings (loss) per share if their effect is anti-dilutive to the loss from continuing operations.

The following table is a reconciliation of basic and diluted shares of common stock outstanding used in the calculation of earnings (loss) per share:

For the three months ended September 30, 2021 and 2020, equity awards of 1,000 and 927, respectively, and for the nine months ended September 30, 2021 and 2020, equity awards of 1,011 and 4,384, respectively, were excluded from the calculation of earnings (loss) per share for these periods as they were anti-dilutive.