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Net Loss Per Share Attributable to Common Stockholders (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Restricted Common Stock Awards
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of weighted average common shares outstanding	63,668	353,379
Stock options
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of weighted average common shares outstanding	8,121,589	5,876,486
RSUs
Anti-dilutive securities
Anti-dilutive securities excluded from the calculation of weighted average common shares outstanding	1,935,026	382,004

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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