Operating Matters, Liquidity and Going Concern - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended					1 Months Ended	6 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Jun. 24, 2013	May 17, 2013	Jun. 29, 2012	May 17, 2013 Common Stock [Member]	Jun. 30, 2013 Common Stock [Member]	Jun. 30, 2012 Common Stock [Member]	Jun. 29, 2012 Series B Preferred Stock [Member]
Line of Credit Facility [Line Items]
Accumulated deficit	$ (110,674,556)		$ (110,674,556)		$ (107,696,665)
Loss from operations	(1,431,221)	(1,116,100)	(2,518,814)	(2,426,213)	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 Percenage Immediately								63.00%
Class Of Warrant Or Right Exercisable Percenage Subject To Shareholder Approval								37.00%
Common Stock Shares Authorized Increase Proposal							300,000,000	300,000,000
Common Stock, Shares Authorized	150,000,000		150,000,000		150,000,000			150,000,000