Capital Stock - Additional Information (Detail) - USD ($)	1 Months Ended			3 Months Ended	6 Months Ended
	Dec. 23, 2014	Sep. 30, 2014	May. 17, 2013	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jul. 21, 2015	Dec. 31, 2014	Aug. 09, 2013
Stockholders Equity [Line Items]
Convertible preferred stock, par value				$ 0.001	$ 0.001
Convertible preferred stock, shares authorized				6,000,000	6,000,000
Common stock, shares authorized				300,000,000	300,000,000			300,000,000
Common stock, par value				$ 0.001	$ 0.001			$ 0.001
Common stock, shares outstanding				172,786,907	172,786,907			172,683,342
Allocated Share-based Compensation Expense				$ 3,000	$ 6,000
Warrants exercise price per share			$ 0.2745
Common Stock Shares Issued				172,786,907	172,786,907			172,683,342
Common Stock Par Or Stated Value Per Share				$ 0.001	$ 0.001			$ 0.001
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			32,786,885	89,731	89,731
Interest Paid					$ 237,500	$ 0
May 2013 Private Placement [Member]
Stockholders Equity [Line Items]
Common stock, shares authorized									150,000,000
Increase In Common Stock Shares Authorized									300,000,000
Venture Loan [Member]
Stockholders Equity [Line Items]
Warrants exercise price per share	$ 0.1003
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	2,492,523
Warrants and Rights Outstanding	$ 261,386
Proceeds from Issuance of Long-term Debt	$ 5,000,000
Warrants Expiration Term	10 years
Interest Paid				$ 113,750	226,250
Paid-in-Kind Interest				38,354	76,707
Debt Instrument, Unamortized Discount				$ 303,597	303,597
Investor [Member]
Stockholders Equity [Line Items]
Sale of Stock, Consideration Received on Transaction	$ 5,025,000
Sale of Stock, Number of Shares Issued in Transaction	50,099,700
Warrants exercise price per share	$ 0.1003
Sale of Stock, Price Per Share	$ 0.1003
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	50,099,700
Warrants Expiration Term	7 years
Danforth Advisors [Member]
Stockholders Equity [Line Items]
Common stock, par value		$ 0.25
Warrants Fair Value Disclosure		$ 23,800
Common Stock Shares Issued		100,000
Common Stock Par Or Stated Value Per Share		$ 0.25
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
Common Stock [Member]
Stockholders Equity [Line Items]
Sale of Stock, Consideration Received on Transaction			$ 12,000,000
Common Stock [Member] | May 2013 Private Placement [Member]
Stockholders Equity [Line Items]
Sale of Stock, Consideration Received on Transaction			$ 12,000,000
Sale of Stock, Number of Shares Issued in Transaction			43,715,847
Sale of Stock, Price Per Share			$ 0.2745
Warrants 2013 [Member]
Stockholders Equity [Line Items]
Percentage Of Warrants Exercisable			63.00%
Percentage Of Warrants Exercisable After Shareholder Approval			37.00%
Warrants 2014 [Member]
Stockholders Equity [Line Items]
Warrants and Rights Outstanding								$ 5,200,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Common stock, shares authorized							450,000,000
Placement Agent Warrants [Member]
Stockholders Equity [Line Items]
Allocated Share-based Compensation Expense					$ 780,000
Warrants To Purchase Of Common Stock					2,295,082
Warrants exercise price per share				$ 0.2745	$ 0.2745
Warrants and Rights Outstanding								$ 9,000
Payments for Underwriting Expense					$ 218,126