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Basis of Presentation (Details 4)	12 Months Ended
Basis of Presentation (Details 4)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock options
Loss per Share
Number of antidilutive securities excluded from the calculation of diluted loss per share	11,324,049	9,734,268	5,964,039
Warrants
Loss per Share
Number of antidilutive securities excluded from the calculation of diluted loss per share	5,647,203	5,647,203	5,597,203

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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