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, 2020 and 2019, equity awards of 927 and 798, respectively, and for the nine months ended September 30, 2020 and 2019, equity awards of 4,384 and 669, respectively, were anti-dilutive and therefore not included in the calculation of earnings (loss) per share for these periods.