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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Derivative income (expense)	$ 305,841	$ 640,153	$ 676,820	$ 1,342,991
Redemptions of Senior Convertible Notes		230,300		863,651
Total derivative income (expense)	305,841	870,453	676,820	2,206,642
Senior Convertible Notes [Member]
Derivative [Line Items]
Derivative income (expense)		202,034	47,243	244,303
2014 Share Purchase Option [Member]
Derivative [Line Items]
Derivative income (expense)	(153,175)		(153,175)
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative income (expense)	$ 459,016	$ 438,119	$ 782,752	$ 1,098,688