Reconciliation of Derivative Liability Used in Determining Fair Value (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Beginning Balance	$ 830,000
Fair value of derivative liability	15,106,387	(765,580)
Change in fair value		113,300
Credited to common stock upon issuance of warrants		(57,034)
Ending Balance	17,190,000	830,000
Conversion options | 12% Convertible revolving credit agreement:
Derivative [Line Items]
Beginning Balance		113,271
Fair value of derivative liability		0
Change in fair value		(113,271)
Credited to common stock upon issuance of warrants		0
Ending Balance		0
Conversion options | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	610,000	0
Fair value of derivative liability	919,554	1,025,691
Change in fair value	10,870,446	(415,691)
Credited to common stock upon issuance of warrants	0	0
Ending Balance	12,400,000	610,000
Warrant | 10% convertible preferred stock warrants
Derivative [Line Items]
Beginning Balance		1,875,463
Fair value of derivative liability		0
Change in fair value		0
Credited to common stock upon issuance of warrants		(1,875,463)
Ending Balance		0
Warrant | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	220,000	0
Fair value of derivative liability	334,059	443,309
Change in fair value	4,235,941	(223,309)
Credited to common stock upon issuance of warrants	0	0
Ending Balance	4,790,000	220,000
Warrant | 10% convertible debenture
Derivative [Line Items]
Beginning Balance		70,343
Fair value of derivative liability		0
Change in fair value		(13,309)
Credited to common stock upon issuance of warrants		(57,034)
Ending Balance		0
Placement agent | Warrant
Derivative [Line Items]
Beginning Balance	81,716	487,555
Fair value of derivative liability	0	0
Change in fair value	214,478	(405,839)
Credited to common stock upon issuance of warrants	0	0
Ending Balance	296,194	81,716
Derivative liabilities - current
Derivative [Line Items]
Beginning Balance	830,000	2,059,077
Fair value of derivative liability	1,253,613	1,469,000
Change in fair value	15,106,387	(765,580)
Credited to common stock upon issuance of warrants	0	(1,932,497)
Ending Balance	17,190,000	830,000
Derivative liabilities - total
Derivative [Line Items]
Beginning Balance	911,716	2,546,632
Fair value of derivative liability	1,253,613	1,469,000
Change in fair value	15,320,865	(1,171,419)
Credited to common stock upon issuance of warrants	0	(1,932,497)
Ending Balance	$ 17,486,194	$ 911,716