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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 |
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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 |  |  |  |

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