Stockholders' Equity - Additional Information 2 (Detail) (USD $)			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 2005 Equity Incentive Plan [Member]	Feb. 28, 2014 2005 Equity Incentive Plan [Member] Directors, Officers and Chief Medical Advisor [Member]	Feb. 28, 2014 2005 Equity Incentive Plan [Member] Directors, Officers and Chief Medical Advisor [Member]	Sep. 30, 2014 Warrants [Member]
Stockholders Equity [Line Items]
Common stock reserved for issuance		283,292
Common stock warrants, issued			1,457,100
Common stock warrants, term			10 years
Common stock warrants, exercise price				$ 0.80
Common stock warrants, premium percentage			57.00%
Intrinsic value of options outstanding	$ 0				$ 0
Intrinsic value of options exercisable	$ 0				$ 0