Net Loss per Common Share

6 Months Ended

Jun. 30, 2011

Net Loss per Common Share

Net Loss per Common Share

2. Net Loss per Common Share

Net loss per common share for the three and six-month periods ended June 30, 2011 and 2010, respectively, is based on the weighted-average number of shares of common stock outstanding during the periods. Basic and diluted loss per share are identical for all periods presented as potentially dilutive securities have been excluded from the calculation of the diluted net loss per common share because the inclusion of such securities would be antidilutive. The potentially dilutive securities include 20,679,931 shares and 18,902,863 in 2011 and 2010, respectively, reserved for the exercise of outstanding options and warrants.