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Net Loss Per Share (Details)	3 Months Ended
Net Loss Per Share (Details)	Mar. 31, 2015	Mar. 31, 2014
Net Loss Per Share
Number of common stock equivalents excluded from the diluted loss per share calculation (in shares)	3,922,202	4,210,747

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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