Reconciliation of Derivative Liability Used in Determining Fair Value (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Beginning Balance	$ 830,000
Fair value of derivative liability	134,300	(242,558)
Ending Balance	7,100,000
Conversion Options | 12% convertible revolving credit agreement conversion options
Derivative [Line Items]
Beginning Balance		113,271
Fair value of derivative liability		0
Change in fair value		13,800
Credited to common stock upon issuance of warrants		0
Ending Balance		127,071
Conversion Options | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	610,000
Fair value of derivative liability	545,425
Change in fair value	3,634,575
Credited to common stock upon issuance of warrants	0
Ending Balance	4,790,000
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
Fair value of derivative liability	249,151
Change in fair value	1,840,849
Credited to common stock upon issuance of warrants	0
Ending Balance	2,310,000
Warrant | 10% convertible debenture
Derivative [Line Items]
Beginning Balance		70,343
Fair value of derivative liability		0
Change in fair value		(10,805)
Credited to common stock upon issuance of warrants		(38,093)
Ending Balance		21,445
Placement Agent | Warrant
Derivative [Line Items]
Beginning Balance	81,716	487,555
Fair value of derivative liability	0	0
Change in fair value	134,300	(242,558)
Credited to common stock upon issuance of warrants	0	0
Ending Balance	216,016	244,997
Derivative liabilities - Current
Derivative [Line Items]
Beginning Balance	830,000	2,059,077
Fair value of derivative liability	794,576	0
Change in fair value	5,475,424	2,995
Credited to common stock upon issuance of warrants	0	(1,913,556)
Ending Balance	7,100,000	148,516
Derivative liabilities - Total
Derivative [Line Items]
Beginning Balance	911,716	2,546,632
Fair value of derivative liability	794,576	0
Change in fair value	5,609,724	(239,563)
Credited to common stock upon issuance of warrants	0	(1,913,556)
Ending Balance	$ 7,316,016	$ 393,513