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Basis of Presentation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
Assets
Derivative asset (warrant)		$ 50,300
Liabilities
Derivative liabilities	3,948,006	4,497,977
Level 1 [Member]
Assets
Derivative asset (warrant)
Liabilities
Derivative liabilities
Level 2 [Member]
Assets
Derivative asset (warrant)		50,300
Liabilities
Derivative liabilities	3,948,006	4,497,977
Level 3 [Member]
Assets
Derivative asset (warrant)
Liabilities
Derivative liabilities

Fair value, after the effects of master netting arrangements, of a financial asset or other 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details