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Loss per Share (Details)	3 Months Ended
Loss per Share (Details)	Mar. 31, 2015	Mar. 31, 2014
Stock options
Loss per Share
Number of antidilutive securities excluded from the calculation of diluted loss per share (in shares)	16,621,065	11,646,060
Warrants
Loss per Share
Number of antidilutive securities excluded from the calculation of diluted loss per share (in shares)	5,951,071	6,013,571

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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