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Fair Value Measurements - Financial Assets and Liabilities Accounted at Fair Value (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Commodity contracts	$ 522,733
Warrant derivative liability	2,213,033	2,808,278
Fair Value Measurements Recurring [Member] \| Fair Value Measurements, Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Commodity contracts
Fair Value Measurements Recurring [Member] \| Fair Value Measurements, Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Commodity contracts	522,733
Fair Value Measurements Recurring [Member] \| Fair Value Measurements, Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Warrant derivative liability	$ 2,213,033	$ 2,808,278

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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