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Stockholders' Equity (Details 1) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Summary of warrants outstanding    
Number of Warrants 6,455,169 14,059,260
Common Stock Warrant Liability $ 6,045,903 $ 19,540,583
March 2013 Financing [Member]
    
Summary of warrants outstanding    
Exercise Price 0.79 0.79
Expiration Date Sep. 12, 2018  
Number of Warrants 2,113,634 3,022,725
Common Stock Warrant Liability 5,875,903 7,859,085
January 2011 financing [Member]
    
Summary of warrants outstanding    
Exercise Price 1.40 1.40
Expiration Date Jan. 27, 2016  
Number of Warrants 0 6,695,000
Common Stock Warrant Liability 0 11,381,498
July 2009 financing [Member]
    
Summary of warrants outstanding    
Exercise Price 3.38 3.38
Expiration Date Jul. 01, 2014  
Number of Warrants 333,333 333,333
Common Stock Warrant Liability 170,000 300,000
Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Number of Warrants 4,008,202 4,008,202
Common Stock Warrant Liability $ 0 $ 0
Minimum [Member] | Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Exercise Price 1.02 1.02
Expiration Date Aug. 01, 2015  
Maximum [Member] | Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Exercise Price 1.28 1.28
Expiration Date Apr. 28, 2016