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Net Loss Per Share (Details)	9 Months Ended
Net Loss Per Share (Details)	Sep. 30, 2013	Sep. 30, 2012
Net Loss Per Share
Antidilutive securities excluded from the calculation of diluted loss per share (in shares)	10,263,751	9,124,403
Options to purchase Common Stock
Net Loss Per Share
Antidilutive securities excluded from the calculation of diluted loss per share (in shares)	3,894,044	3,295,066
Warrants to purchase Common Stock
Net Loss Per Share
Antidilutive securities excluded from the calculation of diluted loss per share (in shares)	6,306,582	5,729,754
Series A Convertible Preferred Stock
Net Loss Per Share
Antidilutive securities excluded from the calculation of diluted loss per share (in shares)	63,125	99,583

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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