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Net Loss Per Share - Summary of Antidilutive Securities Excluded from Computation of Weighted Average Common Stock Outstanding (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Series A Convertible Preferred Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities	6,149	6,149
Series B Convertible Preferred Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities	131,685	93,568
Series C Convertible Preferred Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities	783,515	554,181
Series C-2 Convertible Preferred Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities	173,213	119,958
Series D-1 Convertible Preferred Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities	296,773
Series D-2 Convertible Preferred Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities	300,549
Warrant [Member] \| Common Stock [Member]
Convertible preferred stock:
Anti-Dilutive Securities		26,603
Warrant [Member] \| Series C-1 Preferred [Member]
Convertible preferred stock:
Anti-Dilutive Securities	14,033	9,847
Stock Options [Member]
Convertible preferred stock:
Anti-Dilutive Securities	184,240	152,464
Convertible Notes [Member]
Convertible preferred stock:
Anti-Dilutive Securities		430,493

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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