Stockholders' Equity - Additional Information (Detail) - USD ($)								3 Months Ended		9 Months Ended
	Aug. 04, 2015	Jul. 22, 2015	May 08, 2015	May 01, 2015	Mar. 23, 2015	Feb. 28, 2014	Apr. 04, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Stockholders Equity [Line Items]
Preferred stock converted into common stock								3,718,804	1,826,380	3,718,804	1,826,380
Common stock, shares outstanding								12,975,044		12,975,044		12,775,044
Deemed dividend on preferred stock								$ 627,705		$ 627,705
Total stock-based compensation								703,384	$ 1,161	961,218	$ 508,444
Unvested stock-based compensation at fair value of remaining shares								50,732		50,732
Intrinsic value of options outstanding								0		0
Intrinsic value of options exercisable								0		0
Intrinsic value of warrants outstanding								0		0
Intrinsic value of warrants exercisable								$ 0		$ 0
Directors [Member] | Non-qualified Stock Options [Member]
Stockholders Equity [Line Items]
Non-qualified stock options issued to directors					10,000
Options expiration term					7 years
Options exercise price per share					$ 0.19
Stock options fair value per share					$ 0.14
2005 Equity Incentive Plan [Member]
Stockholders Equity [Line Items]
Common stock reserved for issuance								283,058		283,058
Options expiration term										10 years
Plan expiration date										Oct. 20, 2015
2005 Equity Incentive Plan [Member] | Directors, Officers and Chief Medical Advisor [Member]
Stockholders Equity [Line Items]
Common stock warrants, issued					1,125,000	1,457,100
Common stock warrants, term					10 years	10 years
Common stock warrants, exercise price					$ 0.60	$ 0.80
Common stock warrants, premium percentage					216.00%	57.00%
Common stock warrants, fair value per share					$ 0.10	$ 0.34
2005 Equity Incentive Plan [Member] | Directors and Employees [Member]
Stockholders Equity [Line Items]
Common stock warrants, issued				550,000
Common stock warrants, term				10 years
Common stock warrants, exercise price				$ 0.60
Common stock warrants, premium percentage				20.00%
Common stock warrants, fair value per share				$ 0.37
Common stock warrants, vested				300,000
Vesting period				1 year
2005 Equity Incentive Plan [Member] | Directors and Employees [Member] | 1 Year Cliff Vesting [Member]
Stockholders Equity [Line Items]
Common stock warrants, vested				250,000
2005 Equity Incentive Plan [Member] | Consultant [Member]
Stockholders Equity [Line Items]
Common stock warrants, issued			100,000
Common stock warrants, term			10 years
Common stock warrants, exercise price			$ 0.60
Common stock warrants, premium percentage			33.00%
Common stock warrants, fair value per share			$ 0.41
Common stock warrants, vested			40,000
Agreement termination date										Aug. 04, 2015
Common stock warrants cancelled	60,000
2005 Equity Incentive Plan [Member] | Consultant [Member] | Warrants Vested Over Three Quarters [Member]
Stockholders Equity [Line Items]
Common stock warrants, vested			60,000
Series A Convertible Preferred Stock [Member]
Stockholders Equity [Line Items]
Series A Convertible Preferred stock, shares authorized								40,000,000		40,000,000		40,000,000
Series A Convertible Preferred stock, shares outstanding								1,116		1,116		1,176
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member]
Stockholders Equity [Line Items]
Common stock, shares outstanding		16,693,711						12,975,044		12,975,044
Increase in common stock outstanding, percentage		29.00%
Granted common stock purchase warrants		3,485,908
Additional warrant shares to be granted		3,749,692
Common stock purchase warrants outstanding with anti-dilutive provisions		7,235,600
Weighted average price of warrant		$ 0.71
Total stock-based compensation								$ 693,801
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Series A Convertible Preferred Stock [Member]
Stockholders Equity [Line Items]
Effective conversion price per share		$ 0.30
Series A Convertible Preferred stock, shares outstanding		1,176
Stated value per share for redemption		$ 1,000
Preferred stock redemption period		120 days
Maximum limit on indebtedness		$ 250,000
Preferred stock converted into common stock		3,918,667
Additional preferred stock converted into common stock		2,092,350
Deemed dividend on preferred stock										$ 627,705
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Series A Convertible Preferred Stock [Member] | Maximum [Member]
Stockholders Equity [Line Items]
Effective conversion price per share		$ 0.64
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Series A Convertible Preferred Stock [Member] | Minimum [Member]
Stockholders Equity [Line Items]
Effective conversion price per share		$ 0.30
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Share Purchase Agreement [Member] | Maximum [Member]
Stockholders Equity [Line Items]
Percentage of common stock issued and outstanding							10.00%
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Share Purchase Agreement [Member] | Series A Convertible Preferred Stock [Member]
Stockholders Equity [Line Items]
Series A Convertible Preferred stock, shares authorized							4,012
Effective conversion price per share							$ 0.6437
Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Share Purchase Agreement [Member] | Series A Convertible Preferred Stock [Member] | Maximum [Member]
Stockholders Equity [Line Items]
Proceeds from issuance of preferred stock							$ 4,000,000
Hypothetical Conversion on Exchange and Redemption Agreement with Sabby Healthcare Volatility Master Fund, Ltd. [Member] | Series A Convertible Preferred Stock [Member]
Stockholders Equity [Line Items]
Preferred stock converted into common stock		3,718,667