Common Stock Warrants - Additional Information (Detail) (USD $)	1 Months Ended				1 Months Ended			1 Months Ended	12 Months Ended
	Mar. 09, 2012	Aug. 31, 2010	Mar. 10, 2010	Sep. 23, 2009	Oct. 07, 2011 Institutional And Accredited Investors [Member]	Oct. 12, 2010 Institutional And Accredited Investors [Member]	Mar. 09, 2012 Institutional And Accredited Investors [Member]	Mar. 09, 2012 Accredited Investor [Member]	Jun. 30, 2010 Accredited Investor [Member]	Jun. 30, 2012 Series C Preferred Stock [Member]	Jun. 30, 2010 Placement Agent [Member]
Class of Warrant or Right [Line Items]
Issuance of warrants to purchase common stock	825,000	50,000			1,468,752	3,125,000		3,022,388	200,000	825,000	85,000
Exercise price of warrants		$ 1.40	$ 2.50	$ 2.40	$ 2.00	$ 1.40	$ 1.34		$ 2.40	$ 1.60	$ 2.50
Warrants expiration date		July 2015