Preferred Stock and Warrants (Summary of Preferred Stock) (Detail)	Mar. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Preferred stock, shares issued	198,355	373,355
Preferred stock, shares outstanding	198,355	373,355
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	47,250	47,250
Preferred stock, shares outstanding	47,250	47,250
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	93,750	93,750
Preferred stock, shares outstanding	93,750	93,750
Series C Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	38,333	38,333
Preferred stock, shares outstanding	38,333	38,333
Series D Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	0	175,000
Preferred stock, shares outstanding	0	175,000
Series E Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	19,022	19,022
Preferred stock, shares outstanding	19,022	19,022