Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	$ 176,000		$ 2,053,000
Derivative liability non-current	121		52,720
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	176,000		2,053,000
Derivative Liability - Total	176,121		2,105,720
Fair Value, Measurements, Recurring | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current			1,984,000
Fair Value, Measurements, Recurring | Conversion Options | 12% Convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	176,000		69,000
Fair Value, Measurements, Recurring | Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	121		52,720
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0		0
Derivative Liability - Total	0		0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current			0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Conversion Options | 12% Convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0		0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	0		0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0		0
Derivative Liability - Total	0		0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current			0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Conversion Options | 12% Convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0		0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	0		0
Fair Value, Inputs, Level 3 | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability - Total	0	$ 0	1,984,000	$ 3,872,000	$ 10,695,000	$ 12,400,000
Fair Value, Inputs, Level 3 | Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability - Total				0	0	4,790,000
Fair Value, Inputs, Level 3 | Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	121	$ 121	52,720	$ 52,720	$ 119,703	$ 296,194
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	176,000		2,053,000
Derivative Liability - Total	176,121		2,105,720
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current			1,984,000
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Conversion Options | 12% Convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	176,000		69,000
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	$ 121		$ 52,720