Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended				9 Months Ended		0 Months Ended
	Feb. 24, 2014	Oct. 11, 2013	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Purchase Agreement with Lincoln Park Capital Fund, LLC	Jun. 30, 2014 Series B Preferred Stock	Oct. 11, 2013 Series C Preferred Stock	Jun. 30, 2014 Series C Preferred Stock	Jun. 30, 2014 2000 Stock Option Plan, 2004 Equity Incentive Plan, 2013 Equity Incentive Plan, and Inducement Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital stock authorized for issuance			150,000,000
Common stock, shares authorized			145,000,000	145,000,000
Common stock, par value			$ 0.001	$ 0.001
Preferred stock, shares authorized			5,000,000	5,000,000
Preferred stock, par value			$ 0.001	$ 0.001
Common stock, shares outstanding			52,908,567	32,489,444		2,891,257		2,730,375
Preferred stock, shares outstanding			21,291	9,900		5,291		16,000
Share reserve for issuance									7,182,925
Threshold percentage of common stock ownership upon preferred stock conversion			9.99%
Maximum equity commitment amount under agreement					$ 15,000,000
Equity commitment agreement period					3 years
Cash drawn from facility					1,000,000
Sale of stock, price per share	$ 18.95	$ 5.86					$ 1,000
Issuance and sold of Common Stock	6,325,000	3,071,672					46,000
Conversion price		$ 5.86
Proceeds from issuance of common stock, preferred stock and warrants, net	112,600,000	60,000,000
Aggregate price on issuance or Sale of equity		$ 64,000,000