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Summary of Significant Accounting Policies (Details 2)	3 Months Ended
Summary of Significant Accounting Policies (Details 2)	Mar. 31, 2015	Mar. 31, 2014
Common stock options
Anti-dilutive securities
Outstanding securities not included in the computation of diluted net income (loss) per common share as their inclusion would be anti-dilutive (in shares)	10,123,204	8,179,958
Restricted stock
Anti-dilutive securities
Outstanding securities not included in the computation of diluted net income (loss) per common share as their inclusion would be anti-dilutive (in shares)	734,758	35,000

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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