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9. Net Loss per Common Share (Tables)
6 Months Ended
Jun. 30, 2012
Notes to Financial Statements  
Loss Per share computation

Basic weighted average common shares outstanding, and the potentially dilutive securities excluded from loss per share computations because they are anti-dilutive, are as follows as of June 30, 2012 and 2011, respectively:

 

   

Three and Six Month

Periods Ended June 30,

 
    2012     2011  
Basic and diluted weighted average common stock shares outstanding     69,679,854       69,679,854  
Potentially dilutive securities excluded from loss per share computations:                
Common stock options     19,748,227       17,283,109  
Common stock purchase warrants     7,718,750       4,218,750