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Stockholders' Equity (Details 1) (USD $)
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Summary of warrants outstanding    
Number of Warrants 1,262,143 3,514,817
Common Stock Warrant Liability $ 2,207,388 $ 19,540,583
March 2013 Financing [Member]
    
Summary of warrants outstanding    
Exercise Price $ 3.17 $ 3.17
Expiration Date Sep. 12, 2018  
Number of Warrants 284,091 755,681
Common Stock Warrant Liability 2,207,388 7,859,085
January 2011 financing [Member]
    
Summary of warrants outstanding    
Exercise Price $ 5.60 $ 5.60
Expiration Date Jan. 27, 2016  
Number of Warrants 0 1,673,750
Common Stock Warrant Liability 0 11,381,498
July 2009 financing [Member]
    
Summary of warrants outstanding    
Exercise Price $ 13.50 $ 13.50
Expiration Date Jul. 01, 2014  
Number of Warrants 0 83,334
Common Stock Warrant Liability 0 300,000
Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Number of Warrants 978,052 1,002,052
Common Stock Warrant Liability $ 0 $ 0
Minimum [Member] | Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Exercise Price $ 4.08 $ 4.08
Expiration Date Aug. 01, 2015  
Maximum [Member] | Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Exercise Price $ 5.12 $ 5.12
Expiration Date Apr. 28, 2016