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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative liabilities	$ 970,823	$ 5,356,203
Common shares linked to derivative liabilities	3,817,147	8,059,843
Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	47,243	1,529,583
Common shares linked to derivative liabilities	1,729,647	4,247,343
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	923,580	3,826,620
Common shares linked to derivative liabilities	2,087,500	3,812,500
Senior Convertible Notes [Member] \| Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	47,243	1,529,583
Common shares linked to derivative liabilities	1,729,647	4,247,343
Senior Convertible Notes [Member] \| Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	840,000	1,921,094
Common shares linked to derivative liabilities	1,562,500	1,562,500
Series G Convertible Preferred Stock [Member] \| Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities
Common shares linked to derivative liabilities
Series G Convertible Preferred Stock [Member] \| Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	$ 83,580	$ 1,905,526
Common shares linked to derivative liabilities	525,000	2,250,000

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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