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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	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				450,000,000		450,000,000		450,000,000
Common stock, par value				$ 0.001		$ 0.001		$ 0.001
Allocated Share-based Compensation Expense				$ 3,000	$ 3,000	$ 6,000	$ 6,000
Common Stock Shares Issued				173,029,840		173,029,840		172,887,221
Debt Conversion, Converted Instrument, Shares Issued						2,521,222
Interest Paid						$ 223,708	237,500
Debt Conversion, Original Debt, Amount						14,316,255
May 2013 Private Placement [Member] | Minimum [Member]
Stockholders Equity [Line Items]
Common stock, shares authorized									150,000,000
May 2013 Private Placement [Member] | Maximum [Member]
Stockholders Equity [Line Items]
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				$ 261,000		$ 261,000
Proceeds from Issuance of Long-term Debt	$ 5,000,000
Warrants Expiration Term						10 years
Interest Paid				110,000	124,000	$ 224,000	238,000
Paid-in-Kind Interest				38,000	$ 38,000	77,000	$ 77,000
Debt Instrument, Unamortized Discount				$ 210,000		$ 210,000
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
Danforth Advisors [Member]
Stockholders Equity [Line Items]
Common stock, par value		$ 0.25
Warrants Fair Value Disclosure		$ 24,000
Common Stock Shares Issued		100,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
Common Stock [Member]
Stockholders Equity [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion				39,089,161		39,089,161
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 exercise price per share			$ 0.2745
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			32,786,885
Warrants 2014 [Member]
Stockholders Equity [Line Items]
Warrants and Rights Outstanding				$ 5,200,000		$ 5,200,000
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				89,731		89,731
Warrants and Rights Outstanding				$ 9,000		$ 9,000
Payments for Underwriting Expense						$ 218,000