Debt (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Convertible debt	$ 19,963,662	$ 7,128,187
Less debt discount	(2,173,559)	(1,457,025)
Subtotal - net of debt discount	17,790,103	5,671,162
Less current portion	185,347	0
8% convertible promissory notes	11,030,913	5,671,162
8% convertible promissory notes due on august 2017
Debt Instrument [Line Items]
Convertible debt, due date	2017-08
Convertible debt	13,078,188	7,128,187
12% convertible revolving credit agreement
Debt Instrument [Line Items]
Convertible debt, due date	2015-12
Convertible debt	2,000,000	0
3% promissory note
Debt Instrument [Line Items]
Convertible debt, due date	2018-02
Convertible debt	385,474
4.25% Bank term loans
Debt Instrument [Line Items]
Convertible debt, due date	2018-11
Convertible debt	$ 4,500,000	$ 0