Reconciliation of Derivative Liability Used in Determining Fair Value (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Derivative Liabilities, Non-current			$ 52,720
Derivative Liabilities, Non-current	$ 121		121
Fair value of Derivative Liability			(1,877,000)	$ (10,871,504)
Conversion options | 8% convertible promissory notes | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	381,000	$ 8,404,000	1,984,000	12,400,000
Fair value of Derivative Liability	0	2,960,000	0	3,985,139
Change in Fair Value	(381,000)	(669,000)	(1,984,000)	(5,690,139)
Derivative Liability	0	10,695,000	0	10,695,000
Conversion options | 12% Convertible Promissory Notes | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	158,000		69,000
Fair value of Derivative Liability	0		0
Change in Fair Value	18,000		107,000
Derivative Liability	176,000		176,000
Warrant | 8% convertible promissory notes | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability		3,351,000		4,790,000
Fair value of Derivative Liability		0		391,365
Change in Fair Value		(3,351,000)		(5,181,365)
Derivative Liability		0		0
Placement agent | Warrant | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liabilities, Non-current	52,720	175,221	52,720	296,194
Fair value of Derivative Liability, Non-current	0	0	0	0
Change in Fair Value, Non-current	(52,599)	(55,518)	(52,599)	(176,491)
Derivative Liabilities, Non-current	121	119,703	121	119,703
Derivative liabilities - current | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	539,000	11,755,000	2,053,000	17,190,000
Fair value of Derivative Liability	0	2,960,000	0	4,376,504
Change in Fair Value	(363,000)	(4,020,000)	(1,877,000)	(10,871,504)
Derivative Liability	176,000	10,695,000	176,000	10,695,000
Derivative liabilities - total | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	591,720	11,930,221	2,105,720	17,486,194
Fair value of Derivative Liability	0	2,960,000	0	4,376,504
Change in Fair Value	(415,599)	(4,075,518)	(1,929,599)	(11,047,995)
Derivative Liability	$ 176,121	$ 10,814,703	$ 176,121	$ 10,814,703