Reconciliation of Derivative Liability Used in Determining Fair Value (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
Beginning Balance			$ 830,000
Fair value of derivative liability			294,576	517,400
Ending Balance	1,330,000		1,330,000
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				(113,271)
Credited to common stock upon issuance of warrants				0
Ending Balance		0		0
Conversion options | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	1,520,000	0	610,000	0
Fair value of derivative liability	0	982,932	545,426	982,932
Change in fair value	(460,000)	(262,932)	(95,426)	(262,932)
Credited to common stock upon issuance of warrants	0	0	0	0
Ending Balance	1,060,000	720,000	1,060,000	720,000
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		0
Warrant | 8% convertible promissory notes
Derivative [Line Items]
Beginning Balance	540,000	0	220,000	0
Fair value of derivative liability	0	427,888	249,151	427,888
Change in fair value	(270,000)	(127,888)	(199,151)	(127,888)
Credited to common stock upon issuance of warrants	0	0	0	0
Ending Balance	270,000	300,000	270,000	300,000
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		0
Placement agent | Warrant
Derivative [Line Items]
Beginning Balance	122,357	140,458	81,716	487,555
Fair value of derivative liability	0	0		0
Change in fair value	0	(54,864)	40,641	(401,961)
Credited to common stock upon issuance of warrants	0	0	0	0
Ending Balance	122,357	85,594	122,357	85,594
Derivative liabilities - current
Derivative [Line Items]
Beginning Balance	2,060,000	0	830,000	2,059,077
Fair value of derivative liability	0	1,410,820	794,577	1,410,820
Change in fair value	(730,000)	(390,820)	(294,577)	(517,400)
Credited to common stock upon issuance of warrants	0	0	0	(1,932,497)
Ending Balance	1,330,000	1,020,000	1,330,000	1,020,000
Derivative liabilities - total
Derivative [Line Items]
Beginning Balance	2,182,357	140,458	911,716	2,546,632
Fair value of derivative liability	0	1,410,820	794,577	1,410,820
Change in fair value	(730,000)	(445,684)	(253,936)	(919,361)
Credited to common stock upon issuance of warrants	0	0	0	(1,932,497)
Ending Balance	$ 1,452,357	$ 1,105,594	$ 1,452,357	$ 1,105,594