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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative liabilities	$ 3,149,561	$ 5,356,203
Common shares linked to derivative liabilities	5,793,438	8,059,843
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	2,727,932	3,826,620
Common shares linked to derivative liabilities	3,812,500	3,812,500
Senior Convertible Notes [Member] \| Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities	421,629	1,529,583
Common shares linked to derivative liabilities	1,980,938	4,247,343
Senior Convertible Notes [Member] \| Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	1,463,281	1,921,094
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	$ 1,264,651	$ 1,905,526
Common shares linked to derivative liabilities	2,250,000	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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