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Comprehensive Loss
6 Months Ended
Jun. 30, 2011
Comprehensive Loss [Abstract]  
Comprehensive Loss
4. Comprehensive Loss
The components of comprehensive loss for the three and six months ended June 30, 2011 and 2010 are as follows:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
 
                               
Net loss
  $ (5,258,971 )   $ (5,558,790 )   $ (12,729,631 )   $ (10,351,943 )
Change in net unrealized gains (losses) on investments
    (706 )     3,807       (167 )     (10,660 )
 
                       
Comprehensive loss
  $ (5,259,677 )   $ (5,554,983 )   $ (12,729,798 )   $ (10,362,603 )