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Net Loss Per Share (Details) - 10Q	3 Months Ended
Net Loss Per Share (Details) - 10Q	Mar. 31, 2015	Mar. 31, 2014
Anti-dilutive securities
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)	3,224,052	14,946,373
Redeemable Convertible Preferred Stock [Member]
Anti-dilutive securities
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)		12,516,298
Stock Options
Anti-dilutive securities
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)	3,224,052	2,282,591
Warrants to purchase redeemable convertible preferred stock
Anti-dilutive securities
Anti-dilutive securities excluded from the computation of diluted net loss per share (in shares)		147,484

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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