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Net Loss Per Common Share - Schedule of Common Stock Equivalents of Convertible Preferred Stock, Stock Options, Common Stock Purchase Warrants and Restricted Stock (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	38,663,122	1,635,314
Common Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	2,907,574	1,435,314
Warrants Derivative Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	21,047,641	200,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	65,050
Common Stock Equivalents of Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	14,642,857

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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