Debt (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Convertible debt	$ 22,622,281	$ 19,963,662
Less debt discount	(3,159,292)	(2,173,559)
Subtotal - net of debt discount	19,462,989	17,790,103
Less current portion	185,989	185,347
8% convertible promissory notes	12,688,567	11,030,913
8% convertible promissory notes due on august 2017
Debt Instrument [Line Items]
Convertible debt, due date	2017-08
Convertible debt	15,778,188	13,078,188
12% convertible revolving credit agreement
Debt Instrument [Line Items]
Convertible debt, due date	2015-12
Convertible debt	2,000,000	2,000,000
3% promissory note
Debt Instrument [Line Items]
Convertible debt, due date	2018-02
Convertible debt	344,093	385,474
4.25% Bank term loans
Debt Instrument [Line Items]
Convertible debt, due date	2018-11
Convertible debt	$ 4,500,000	$ 4,500,000