Subsequent Event - Additional Information (Detail) (USD $)	9 Months Ended			0 Months Ended	1 Months Ended		0 Months Ended
	Sep. 30, 2013	May 31, 2013	Dec. 31, 2012	Oct. 29, 2013 Subsequent Event [Member]	Oct. 31, 2013 Subsequent Event [Member]	Oct. 29, 2013 Subsequent Event [Member] Series B Warrants [Member]	Oct. 29, 2013 Subsequent Event [Member] Series A Warrants [Member]
Subsequent Event [Line Items]
Common stock issued	43,139,027	75,000	32,204,720	4,228,181
Warrants issued to purchase common stock						4,343,247	6,857,142
Proceeds from issuance of common stock and warrants	$ 6,000,000			$ 6,000,000
Warrants issued to purchase common stock, exercise price							0.85
Warrants exercisable date							May 01, 2014
Warrants expiry date							May 01, 2019
Closing date of offering					Oct. 31, 2013