Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended				3 Months Ended	9 Months Ended		12 Months Ended	122 Months Ended		1 Months Ended			1 Months Ended		9 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended
	May 31, 2013	Jan. 31, 2013	Dec. 31, 2012	Aug. 10, 2012	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2013	Sep. 30, 2012	Feb. 29, 2012 Series A Preferred Stock	Oct. 31, 2011 Series A Preferred Stock	Oct. 24, 2011 Series A Preferred Stock	May 31, 2013 Series B convertible preferred stock	Oct. 31, 2011 Subscription Agreement	Jun. 30, 2012 Subscription Agreement Series A Preferred Stock	Oct. 31, 2011 Common Stock	Sep. 30, 2011 Common Stock	Dec. 31, 2012 Common Stock	Sep. 30, 2012 Common Stock	Sep. 30, 2011 Common Stock	Sep. 30, 2010 Common Stock	Sep. 30, 2005 Common Stock	Jun. 30, 2013 Common Stock	Oct. 21, 2011 Common Stock	Oct. 04, 2011 Common Stock	Jun. 30, 2013 2004 Equity Incentive Plan	Jun. 30, 2013 2000 Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital stock authorized for issuance					150,000,000	150,000,000			150,000,000
Common stock, shares authorized					145,000,000	145,000,000			145,000,000	145,000,000
Common stock, par value					$ 0.001	$ 0.001			$ 0.001	$ 0.001
Preferred stock, shares authorized					5,000,000	5,000,000			5,000,000	5,000,000
Preferred stock, par value					$ 0.001	$ 0.001			$ 0.001	$ 0.001			$ 0.001
Common stock, shares outstanding					31,306,318	31,306,318			31,306,318	13,579,185
Preferred stock, shares outstanding					9,900	9,900			9,900	9,900
Share reserve for issuance																											3,369,960	3,369,960
Additional Share reserve for issuance of warrants outstanding					6,055,535	6,055,535			6,055,535
Issuance and sold of stock	14,300,000.0			2,260,869										9,900	675,000	1,015	138,158	1,191,473	1,825,079	15,511	8,656	225,189	1,250
Sale of stock, price per share	$ 1.83			$ 2.76									$ 1,000	$ 1,000				$ 3.80	$ 2.26		$ 3.80				$ 3.70	$ 3.80
Proceeds from issuance of common stock and warrants, net	$ 35,400,000	$ 3,500,000		$ 6,200,000		$ 42,448,824	$ 5,401,392		$ 148,701,835								$ 525,000	$ 4,500,000	$ 4,100,000
Aggregate purchase price of preferred shares								1,618,509				1,015,000
Preferred stock converted to common stock, shares											275,782
Aggregate purchase price on issuance of common stock to be received																	2,497,500
Warrant to purchase common stock				0.75															0.5
Common stock exercise price				$ 3.25
Exercise price of warrant		1.83			1.83	1.83			1.83															1.83
Unit sold, description		Each unit consisted of one share of Common Stock and a warrant to purchase	Each unit consisted of one share of Common Stock and a warrant to purchase
Shares issued under public offering		1,667,051	1,800,000.0		1,170,000
Shares issued under public offering, price per share		$ 2.12	$ 2.26
Warrant to purchase share of Common Stock		0.5	0.5
Conversion price	$ 1.83
Gross proceeds from offering	$ 36,000,000	$ 3,300,000	$ 3,800,000		$ 1,200,000	$ 42,400,000