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Stock-based Compensation (Schedule of Allocated Stock-Based Compensation) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock-based compensation        
Total $ 13,689 $ 61,415 $ 13,961 $ 255,001
General and Administrative Expense [Member]
       
Stock-based compensation        
Total 13,689 38,719 13,961 158,947
Research and Development Expense [Member]
       
Stock-based compensation        
Total    $ 22,696    $ 96,054