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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative liabilities	$ 1,153,536	$ 970,823
Common shares linked to derivative liabilities	2,831,437	3,817,147
Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities		47,243
Common shares linked to derivative liabilities	743,937	1,729,647
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	1,153,536	923,580
Common shares linked to derivative liabilities	2,087,500	2,087,500
Senior Convertible Notes [Member] \| Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities		47,243
Common shares linked to derivative liabilities	743,937	1,729,647
Senior Convertible Notes [Member] \| Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	858,906	840,000
Common shares linked to derivative liabilities	1,562,500	1,562,500
Series G Convertible Preferred Stock [Member] \| Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	$ 294,630	$ 83,580
Common shares linked to derivative liabilities	525,000	525,000

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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