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Stock-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation [Abstract]        
Total employee stock-based compensation expense $ 767,153 $ 664,384 $ 2,227,144 $ 2,613,111
Effect on basic and diluted net loss per share $ (0.03) $ (0.05) $ (0.09) $ (0.19)
Research and development expense [Member]
       
Share-based Compensation [Abstract]        
Total employee stock-based compensation expense 314,393 343,845 966,570 1,304,846
Selling, general and administrative expense [Member]
       
Share-based Compensation [Abstract]        
Total employee stock-based compensation expense $ 452,760 $ 320,539 $ 1,260,574 $ 1,308,265