Operating Matters and Liquidity - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended						1 Months Ended	9 Months Ended			12 Months Ended		1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Aug. 09, 2013	May 17, 2013	Dec. 31, 2012	Jun. 29, 2012	May 17, 2013 Common Stock [Member]	Sep. 30, 2013 Common Stock [Member]	Sep. 30, 2012 Common Stock [Member]	Sep. 30, 2013 Accumulated Deficit	Dec. 31, 2012 Accumulated Deficit	Dec. 31, 2011 Accumulated Deficit	Jun. 29, 2012 Series B Preferred Stock [Member]
Line of Credit Facility [Line Items]
Accumulated deficit	$ (112,850,613)		$ (112,850,613)				$ (107,696,665)
Loss from operations	(2,167,577)	(1,170,585)	(4,686,391)	(3,596,799)								5,200,000	5,100,000	5,000,000
Stock Issued During Period, Shares, New Issues									43,715,847	43,715,847	0
Share Price									$ 0.2745
Proceeds from private placement of common stock			$ 12,000,000	$ 0					$ 12,000,000		$ 12,000,000				$ 3,000,000
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						32,786,885
Class Of Warrant Or Right Exercisable Percentage Immediately					63.00%	63.00%
Class Of Warrant Or Right Exercisable Percentage Subject To Shareholder Approval					37.00%	37.00%
Common Stock Shares Authorized Increase	300,000,000		300,000,000		300,000,000	300,000,000
Common Stock, Shares Authorized	300,000,000		300,000,000		150,000,000	150,000,000	150,000,000			300,000,000