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Stockholders' Equity (Details 1) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Summary of warrants outstanding    
Number of Warrants 35,225,566 21,593,844
Common Stock Warrant Liability $ 13,453,937 $ 2,859,899
March 2013 Financing [Member]
    
Summary of warrants outstanding    
Exercise Price 0.79  
Expiration Date Sep. 12, 2018  
Number of Warrants 13,688,633 0
Common Stock Warrant Liability 9,102,940 0
December 2011 financing [Member]
    
Summary of warrants outstanding    
Exercise Price 0.65  
Expiration Date Dec. 06, 2016  
Number of Warrants 5,774,784 5,774,784
Common Stock Warrant Liability 2,309,913 2,078,921
January 2011 financing [Member]
    
Summary of warrants outstanding    
Exercise Price 1.40  
Expiration Date Jan. 27, 2016  
Number of Warrants 10,565,200 10,565,200
Common Stock Warrant Liability 2,039,084 779,711
July 2009 financing [Member]
    
Summary of warrants outstanding    
Exercise Price 3.38  
Expiration Date Jul. 01, 2014  
Number of Warrants 333,333 333,333
Common Stock Warrant Liability 2,000 1,267
Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Number of Warrants 4,863,616 4,920,527
Common Stock Warrant Liability $ 0 $ 0
Minimum [Member] | Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Exercise Price 0.05  
Expiration Date Sep. 27, 2013  
Maximum [Member] | Warrants assumed in June 2009 Merger [Member]
    
Summary of warrants outstanding    
Exercise Price 1.28  
Expiration Date Apr. 28, 2016