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Basis of Presentation - Reconciliation of Beginning and Ending Balances of Assets and Liabilities Measured at Fair Value Using Significant Observable Inputs (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Assets [Member]
Basis Of Presentation [Line Items]
Warrant asset as of December 31, 2012	$ 50,300
Decrease in fair value of warrants	(50,300)
Warrant asset as of September 30, 2013
Warrant asset as of December 31, 2012	2,000,000
Decrease in fair value of warrants	(2,000,000)
Warrant asset as of September 30, 2013
Liabilities [Member]
Basis Of Presentation [Line Items]
Warrant liability as of December 31, 2012	4,497,977
Decrease in fair value of warrants	(549,971)
Warrant liability as of September 30, 2013	$ 3,948,006
Warrant liability as of December 31, 2012	2,009,436
Decrease in fair value of warrants
Warrant liability as of September 30, 2013	2,009,436

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