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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012 Series A-1 Convertible Preferred Stock [Member]	Dec. 31, 2011 Series A-1 Convertible Preferred Stock [Member]	Dec. 31, 2012 Series A-2 Convertible Preferred Stock [Member]	Dec. 31, 2011 Series A-2 Convertible Preferred Stock [Member]	Dec. 31, 2012 Series B Convertible Preferred Stock [Member]	Dec. 31, 2011 Series B Convertible Preferred Stock [Member]	Dec. 31, 2012 Series C Convertible Preferred Stock [Member]	Dec. 31, 2011 Series C Convertible Preferred Stock [Member]	Dec. 31, 2012 Series D Convertible Preferred Stock [Member]	Dec. 31, 2011 Series D Convertible Preferred Stock [Member]	Dec. 31, 2012 Series D-2 Convertible Preferred Stock [Member]	Dec. 31, 2011 Series D-2 Convertible Preferred Stock [Member]	Dec. 31, 2012 Warrant [Member]	Dec. 31, 2011 Warrant [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded in calculation of earning per share	116,270	2,156,114	2,156,114	392,274	392,274	4,336,037	4,336,037	5,909,906	5,909,906	769,468	769,468	3,391,991	3,391,991	180,784	180,784	3,249,702	2,885,417

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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