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Loss per Share (Details)	3 Months Ended
Loss per Share (Details)	Mar. 31, 2014	Mar. 31, 2013
Stock options
Loss per Share
Number of antidilutive securities excluded from the calculation of diluted loss per share (in shares)	11,646,060	10,449,232
Warrants
Loss per Share
Number of antidilutive securities excluded from the calculation of diluted loss per share (in shares)	5,647,203	5,647,203

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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