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Stockholders' Equity (Details 1) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2011
Dec. 31, 2013
March 2013 financing [Member]
Dec. 31, 2012
March 2013 financing [Member]
Dec. 31, 2013
December 2011 financing [Member]
Dec. 31, 2012
December 2011 financing [Member]
Dec. 31, 2013
January 2011 financing [Member]
Dec. 31, 2012
January 2011 financing [Member]
Dec. 31, 2013
July 2009 financing [Member]
Dec. 31, 2012
July 2009 financing [Member]
Dec. 31, 2013
Warrants assumed in June 2009 Merger [Member]
Dec. 31, 2012
Warrants assumed in June 2009 Merger [Member]
Dec. 31, 2013
Minimum [Member]
Warrants assumed in June 2009 Merger [Member]
Dec. 31, 2012
Minimum [Member]
Warrants assumed in June 2009 Merger [Member]
Dec. 31, 2013
Maximum [Member]
Warrants assumed in June 2009 Merger [Member]
Dec. 31, 2012
Maximum [Member]
Warrants assumed in June 2009 Merger [Member]
Summary of warrants outstanding                                  
Exercise Price     1.40 0.79 0.79 0.65 0.65 1.40 1.40 3.38 3.38     1.02 1.02 1.28 1.28
Expiration Date       Sep. 12, 2018   Dec. 06, 2016   Jan. 27, 2016   Jul. 01, 2014       Aug. 01, 2015   Apr. 28, 2016  
Number of Warrants 14,059,260 21,593,844   3,022,725 0 0 5,774,784 6,695,000 10,565,200 333,333 333,333 4,008,202 4,920,527        
Common Stock Warrant Liability $ 19,540,583 $ 2,859,899   $ 7,859,085 $ 0 $ 0 $ 2,078,921 $ 11,381,498 $ 779,711 $ 300,000 $ 1,267 $ 0 $ 0