Reconciliation of Derivative Liability Used in Determining Fair Value (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivative [Line Items]
Beginning Balance			$ 830,000
Fair value of derivative liability			(435,424)	126,580
Ending Balance	2,060,000		2,060,000
Conversion Options | 12% convertible revolving credit agreement conversion options
Derivative [Line Items]
Beginning Balance		127,071		113,271
Fair value of derivative liability		0		0
Change in fair value		(127,071)		(113,271)
Credited to common stock upon issuance of warrants		0		0
Ending Balance		0		0
Conversion Options | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	4,790,000		610,000	0
Fair value of derivative liability	0		545,425	0
Change in fair value	(3,270,000)		364,575	0
Credited to common stock upon issuance of warrants	0		0	0
Ending Balance	1,520,000	0	1,520,000	0
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		0
Warrant | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	2,310,000		220,000	0
Fair value of derivative liability	0		249,151	0
Change in fair value	(1,770,000)		70,849	0
Credited to common stock upon issuance of warrants	0		0	0
Ending Balance	540,000	0	540,000	0
Warrant | 10% convertible debenture
Derivative [Line Items]
Beginning Balance		21,445		70,343
Fair value of derivative liability		0		0
Change in fair value		(2,504)		(13,309)
Credited to common stock upon issuance of warrants		(18,941)		(57,034)
Ending Balance		0		0
Placement Agent | Warrant
Derivative [Line Items]
Beginning Balance	216,016	244,997	81,716	487,555
Fair value of derivative liability	0	0		0
Change in fair value	(93,659)	(104,539)	40,641	(347,097)
Credited to common stock upon issuance of warrants	0	0	0	0
Ending Balance	122,357	140,458	122,357	140,458
Derivative liabilities - Current
Derivative [Line Items]
Beginning Balance	7,100,000	148,516	830,000	2,059,077
Fair value of derivative liability	0	0	794,576	0
Change in fair value	(5,040,000)	(129,575)	435,424	(126,580)
Credited to common stock upon issuance of warrants	0	(18,941)	0	(1,932,497)
Ending Balance	2,060,000	0	2,060,000	0
Derivative liabilities - Total
Derivative [Line Items]
Beginning Balance	7,316,016	393,513	911,716	2,546,632
Fair value of derivative liability	0	0	794,576	0
Change in fair value	(5,133,659)	(234,114)	476,065	(473,677)
Credited to common stock upon issuance of warrants	0	(18,941)	0	(1,932,497)
Ending Balance	$ 2,182,357	$ 140,458	$ 2,182,357	$ 140,458