Reconciliation of Derivative Liability Used in Determining Fair Value (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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)	$ (18,142,504)
Conversion options | 8% convertible promissory notes | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	0	$ 10,695,000	1,984,000	12,400,000
Fair value of Derivative Liability	0	402,000	0	4,387,139
Change in Fair Value	0	(7,225,000)	(1,984,000)	(12,915,139)
Derivative Liability	0	3,872,000	0	3,872,000
Conversion options | 12% Convertible Promissory Notes | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	176,000	0	69,000	0
Fair value of Derivative Liability	0	157,000	0	157,000
Change in Fair Value	0	(46,000)	107,000	(46,000)
Derivative Liability	176,000	111,000	176,000	111,000
Warrant | 8% convertible promissory notes | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability		0		4,790,000
Fair value of Derivative Liability		0		391,365
Change in Fair Value		0		(5,181,365)
Derivative Liability		0		0
Placement agent | Warrant | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liabilities, Non-current	121	119,703	52,720	296,194
Fair value of Derivative Liability, Non-current	0	0	0	0
Change in Fair Value, Non-current	0	(66,983)	(52,599)	(243,474)
Derivative Liabilities, Non-current	121	52,720	121	52,720
Derivative liabilities - current | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	176,000	10,695,000	2,053,000	17,190,000
Fair value of Derivative Liability	0	559,000	0	4,935,504
Change in Fair Value	0	(7,271,000)	(1,877,000)	(18,142,504)
Derivative Liability	176,000	3,983,000	176,000	3,983,000
Derivative liabilities - total | Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative Liability	176,121	10,814,703	2,105,720	17,486,194
Fair value of Derivative Liability	0	559,000	0	4,935,504
Change in Fair Value	0	(7,337,983)	(1,929,599)	(18,385,978)
Derivative Liability	$ 176,121	$ 4,035,720	$ 176,121	$ 4,035,720