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Weighted Average Common Shares
12 Months Ended
Dec. 31, 2011
Weighted Average Common Shares [Abstract]  
Weighted Average Common Shares

14.  Weighted Average Common Shares

Basic income/(loss) per Common Share is computed by dividing income/(loss) by the weighted average number of Common Shares outstanding during the period.  Diluted income per Common Share is computed similarly to basic income per Common Share except that weighted average Common Shares are increased to include the potential issuance of dilutive Common Shares.

   
Year Ended December 31,
 
   
2011
  
2010
 
Weighted average Common Shares:
      
Basic
  68,457,885   47,335,571 
Effect of dilutive employee stock-based awards
  637,081   - 
Effect of dilutive warrants
  200,981     
Diluted
  69,295,947   47,335,571 

Stock options to purchase 1,870,000 and 2,588,661 Common Shares, warrants to purchase 15,219,802 and 16,138,480 Common Shares were outstanding at December 31, 2011 and 2010, respectively, but were not included in the computation of diluted weighted average Common Shares outstanding because their effect would have been anti-dilutive.