Earnings (Loss) Per Share

3 Months Ended

Mar. 31, 2012

Earnings (Loss) Per Share [Abstract]

Earnings (Loss) Per Share

12.  Earnings (Loss) Per Share

Earnings or loss per share is calculated by dividing the net income or loss for the period by the weighted average number of shares of common stock outstanding during the period. Diluted earnings or loss per share ("Diluted EPS") is calculated by dividing the net income or loss for the period by the total of the weighted average number of shares of common stock outstanding during the period plus the effects of any dilutive securities. Diluted EPS considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential shares of common stock would have an anti-dilutive effect.

During both periods presented in our Condensed Consolidated Statements of Operations, potentially dilutive securities included shares of common stock potentially issuable upon exercise of stock options. During the three-month period ended March 31, 2012, potentially dilutive securities also included common stock potentially issuable upon exercise of warrants. Diluted EPS excludes the impact of potential issuance of shares of common stock related to our stock options in periods in which the exercise price of the stock option is greater than the average market price of our common stock during such periods.

For the three-month periods ended March 31, 2012 and 2011, 37,458,105 and 5,479,043 shares of common stock equivalents, respectively, were excluded from the computation of dilutive loss per share since their effect would be antidilutive.