Operating Matters and Liquidity - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended		1 Months Ended
	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 23, 2014	May 17, 2013
Line of Credit Facility [Line Items]
Net Income Loss		$ (6,335,714)	$ (7,057,933)
Accumulated deficit		(121,090,312)	(114,754,598)
Stock Issued During Period Shares New Issues	18,214,936
Share Price	$ 0.2745
Proceeds from Issuance of Private Placement		5,025,000	12,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.2745				$ 0.2745
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	13,661,201				32,786,885
December 2014 Private Placement [Member]
Line of Credit Facility [Line Items]
Stock Issued During Period Shares New Issues				50,099,700
Share Price				$ 0.1003
Proceeds from Issuance of Private Placement				5,025,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.1003
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				50,099,700
Common Stock [Member]
Line of Credit Facility [Line Items]
Net Income Loss		0	0
Stock Issued During Period Shares New Issues					43,715,847
Proceeds from Issuance of Private Placement					$ 12,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.2745