Fair Value Measurements	6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	12. Fair Value Measurements Accounting standards define fair value, outline a framework for measuring fair value, and detail the required disclosures about fair value measurements. Under these standards, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in the principal or most advantageous market. Standards establish a hierarchy in determining the fair market value of an asset or liability. The fair value hierarchy has three levels of inputs, both observable and unobservable. Standards require the utilization of the highest possible level of input to determine fair value. Level 1 – inputs include quoted market prices in an active market for identical assets or liabilities. Level 2 – inputs are market data, other than Level 1, that are observable either directly or indirectly. Level 2 inputs include quoted market prices for similar assets or liabilities, quoted market prices in an inactive market, and other observable information that can be corroborated by market data. Level 3 – inputs are unobservable and corroborated by little or no market data. Inventories. The Company records its inventory, primarily corn inventory, at fair value only when the Company’s cost of corn purchased exceeds the market value for corn. The Company determines the market value of corn based upon Level 1 inputs using quoted market prices. The Company incurred a write-down of inventory of $0.1 million during the six months ended June 30, 2015. The Company incurred no write-down of inventory during the six months ended June 30, 2016. Secured Debt. The Company has estimated the fair value of its secured debt obligations based upon discounted cash flows with Level 3 inputs, such as the terms that management believes would currently be available to the Company for similar issues of debt, taking into account the current credit risk of the Company and other market factors. 2017 Notes. The Company has estimated the fair value of the 2017 Notes to be $23.3 million and $21.6 million at June 30, 2016 and December 31, 2015, respectively, based upon Level 2 inputs, including the market price of the Company’s common stock. The Company has valued the 2017 Notes and all of its components using the fair value option as there are no embedded instruments which qualify for equity presentation. See Note 7 for the fair value inputs used to estimate the fair value of the 2017 Notes. 2022 Notes Embedded Derivative. The Company has estimated the fair value of the 2022 Notes, including the embedded derivative, to be $16.8 million and $14.6 million at June 30, 2016 and December 31, 2015, respectively, based upon Level 2 inputs, including the market price of the 2022 Notes derived from actual trades of the 2022 Notes. The Company has estimated the fair value of the embedded derivative on a stand-alone basis to be zero at June 30, 2016 and December 31, 2015, based upon Level 2 inputs. See Note 5 above for the fair value inputs used to estimate the fair value of the 2022 Notes with and without the embedded derivative and the fair value of the embedded derivative. Derivative Warrant Liability. In December 2013, the Company issued 2013 Warrants to purchase 1,420,250 shares of the Company’s common stock. Based on the terms of the 2013 Warrants, the Company determined that the 2013 Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the 2013 Warrants as of December 31, 2015 to be $0.2 million based upon Level 3 inputs, utilizing an analysis of actual historical market trades of the 2013 Warrants and the Black Scholes model. The Company determined the estimated fair value of the 2013 Warrants as of June 30, 2016 to be $0.2 million based upon Level 3 inputs utilizing an analysis of actual historical market trades of the 2013 Warrants and the Black Scholes model. In August of 2014, the Company issued 2014 Warrants to purchase 1,000,000 shares of the Company’s common stock. Based on the terms of the 2014 Warrants, the Company determined that the 2014 Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the 2014 Warrants as of December 31, 2015 and June 30, 2016 to be $0.1 million and $0.1 million, respectively based upon Level 3 inputs utilizing an analysis of actual historical market trades of the 2014 Warrants and the Black Scholes model. The Company relied on Level 3 inputs for estimating the fair value of the 2014 Warrants as of June 30, 2016 due to the lack of market trades of the 2014 Warrants during the six months ended June 30, 2016. In February of 2015, the Company issued Series A Warrants to purchase 2,216,667 shares of the Company’s common stock. Based on the terms of the Series A Warrants, the Company determined that the Series A Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series A Warrants at the issuance date of February 3, 2015 to be $1.4 million. As of December 31, 2015 and June 30, 2016, the estimated fair value of the Series A Warrants was $0.9 million and $0.1 million respectively based upon Level 3 inputs utilizing a Monte-Carlo simulation model. In February of 2015, the Company issued Series B Warrants to purchase 2,216,667 shares of the Company’s common stock. Based on the terms of the Series B Warrants, the Company determined that the Series B Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series B Warrants at the issuance date of February 3, 2015 to be $2.5 million based upon Level 3 inputs. As of both December 31, 2015 and June 30, 2016 the estimated fair value was $0.0 as the Series B Warrants expired on August 3, 2015. In May of 2015, the Company issued Series C Warrants to purchase 430,000 shares of the Company’s common stock. Based on the terms of the Series C Warrants, the Company determined that the Series C Warrants qualify as a derivative and, as such, are presented as derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series C Warrants at the issuance date of May 19, 2015 to be $1.2 million. As of December 31, 2015 and June 30, 2016, the estimated fair value was $0.1 million and $0.1 million, respectively based upon Level 3 inputs utilizing an analysis of actual historical market trades of the Series C Warrants and the Black Scholes model. The Company relied on Level 3 inputs for estimating the fair value of the Series C Warrants as of May 19, 2015, December 31, 2015 and June 30, 2016 due to the lack of market trades of the Series C Warrants. In December 2015, the Company issued 10,050,000 Series D Warrants and 8,000,000 Series E Warrants. Based on the terms of the Series D Warrants and Series E Warrants, the Company determined that the each of the Series D Warrants and Series E Warrants qualify as a derivative and, as such, are presented as derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series D Warrants to be $5.7 million as of the issuance date, $5.2 million as of December 31, 2015 and $0.02 million as of June 30, 2016 utilizing a Black Scholes model. The Company relied on Level 1 inputs of the market price for estimating the fair value of the Series E Warrants, and determined the fair value to be $5.3 million as of the issuance date, $4.0 million as of December 31, 2015, and were fully exercised as of June 30, 2016. In April 2016, the Company issued 10,292,858 Series F Warrants, 6,571,429 Series G Warrants, and 20,585,716 Series H Warrants. Based on the terms of the Series F Warrants, Series G Warrants and the Series H Warrants, the Company determined that each of the Series F Warrants, Series G Warrants and Series H Warrants qualify as a derivative and, as such, are presented as derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company relied on Level 3 inputs for estimating the fair value of the Series F warrants and utilized a Monte Carlo simulation and determined the estimated fair value to be $2.2 million as of the April 1, 2016 issuance date. The Company relied on Level 3 inputs for estimating the fair value of the Series H warrants and utilized a Black Scholes model and determined the estimated fair value to be $0.3 million as of the April 1, 2016 issuance date. The Company relied on Level 1 inputs for estimating the fair value of the Series G warrants and determined the estimated fair value to be $1.6 million as of the April 1, 2016 issuance date. The Series F and H warrants were determined to have an estimated fair value of $5.4 million and $0.4 million, respectively, as of June 30, 2016. The Series G warrants were fully exercised and no longer outstanding as of June 30, 2016. While the Company believes that its valuation methods are appropriate and consistent with other market participants, it recognizes that the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.

12. Fair Value Measurements

Accounting standards define fair value, outline a framework for measuring fair value, and detail the required disclosures about fair value measurements. Under these standards, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in the principal or most advantageous market. Standards establish a hierarchy in determining the fair market value of an asset or liability. The fair value hierarchy has three levels of inputs, both observable and unobservable. Standards require the utilization of the highest possible level of input to determine fair value.

Level 1 – inputs include quoted market prices in an active market for identical assets or liabilities.

Level 2 – inputs are market data, other than Level 1, that are observable either directly or indirectly. Level 2 inputs include quoted market prices for similar assets or liabilities, quoted market prices in an inactive market, and other observable information that can be corroborated by market data.

Level 3 – inputs are unobservable and corroborated by little or no market data.

Inventories. The Company records its inventory, primarily corn inventory, at fair value only when the Company’s cost of corn purchased exceeds the market value for corn. The Company determines the market value of corn based upon Level 1 inputs using quoted market prices. The Company incurred a write-down of inventory of $0.1 million during the six months ended June 30, 2015. The Company incurred no write-down of inventory during the six months ended June 30, 2016.

Secured Debt. The Company has estimated the fair value of its secured debt obligations based upon discounted cash flows with Level 3 inputs, such as the terms that management believes would currently be available to the Company for similar issues of debt, taking into account the current credit risk of the Company and other market factors.

2017 Notes. The Company has estimated the fair value of the 2017 Notes to be $23.3 million and $21.6 million at June 30, 2016 and December 31, 2015, respectively, based upon Level 2 inputs, including the market price of the Company’s common stock. The Company has valued the 2017 Notes and all of its components using the fair value option as there are no embedded instruments which qualify for equity presentation. See Note 7 for the fair value inputs used to estimate the fair value of the 2017 Notes.

2022 Notes Embedded Derivative. The Company has estimated the fair value of the 2022 Notes, including the embedded derivative, to be $16.8 million and $14.6 million at June 30, 2016 and December 31, 2015, respectively, based upon Level 2 inputs, including the market price of the 2022 Notes derived from actual trades of the 2022 Notes. The Company has estimated the fair value of the embedded derivative on a stand-alone basis to be zero at June 30, 2016 and December 31, 2015, based upon Level 2 inputs. See Note 5 above for the fair value inputs used to estimate the fair value of the 2022 Notes with and without the embedded derivative and the fair value of the embedded derivative.

Derivative Warrant Liability. In December 2013, the Company issued 2013 Warrants to purchase 1,420,250 shares of the Company’s common stock. Based on the terms of the 2013 Warrants, the Company determined that the 2013 Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the 2013 Warrants as of December 31, 2015 to be $0.2 million based upon Level 3 inputs, utilizing an analysis of actual historical market trades of the 2013 Warrants and the Black Scholes model. The Company determined the estimated fair value of the 2013 Warrants as of June 30, 2016 to be $0.2 million based upon Level 3 inputs utilizing an analysis of actual historical market trades of the 2013 Warrants and the Black Scholes model.

In August of 2014, the Company issued 2014 Warrants to purchase 1,000,000 shares of the Company’s common stock. Based on the terms of the 2014 Warrants, the Company determined that the 2014 Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the 2014 Warrants as of December 31, 2015 and June 30, 2016 to be $0.1 million and $0.1 million, respectively based upon Level 3 inputs utilizing an analysis of actual historical market trades of the 2014 Warrants and the Black Scholes model. The Company relied on Level 3 inputs for estimating the fair value of the 2014 Warrants as of June 30, 2016 due to the lack of market trades of the 2014 Warrants during the six months ended June 30, 2016.

In February of 2015, the Company issued Series A Warrants to purchase 2,216,667 shares of the Company’s common stock. Based on the terms of the Series A Warrants, the Company determined that the Series A Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series A Warrants at the issuance date of February 3, 2015 to be $1.4 million. As of December 31, 2015 and June 30, 2016, the estimated fair value of the Series A Warrants was $0.9 million and $0.1 million respectively based upon Level 3 inputs utilizing a Monte-Carlo simulation model.

In February of 2015, the Company issued Series B Warrants to purchase 2,216,667 shares of the Company’s common stock. Based on the terms of the Series B Warrants, the Company determined that the Series B Warrants qualify as a derivative and, as such, are presented as a derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series B Warrants at the issuance date of February 3, 2015 to be $2.5 million based upon Level 3 inputs. As of both December 31, 2015 and June 30, 2016 the estimated fair value was $0.0 as the Series B Warrants expired on August 3, 2015.

In May of 2015, the Company issued Series C Warrants to purchase 430,000 shares of the Company’s common stock. Based on the terms of the Series C Warrants, the Company determined that the Series C Warrants qualify as a derivative and, as such, are presented as derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series C Warrants at the issuance date of May 19, 2015 to be $1.2 million. As of December 31, 2015 and June 30, 2016, the estimated fair value was $0.1 million and $0.1 million, respectively based upon Level 3 inputs utilizing an analysis of actual historical market trades of the Series C Warrants and the Black Scholes model. The Company relied on Level 3 inputs for estimating the fair value of the Series C Warrants as of May 19, 2015, December 31, 2015 and June 30, 2016 due to the lack of market trades of the Series C Warrants.

In December 2015, the Company issued 10,050,000 Series D Warrants and 8,000,000 Series E Warrants. Based on the terms of the Series D Warrants and Series E Warrants, the Company determined that the each of the Series D Warrants and Series E Warrants qualify as a derivative and, as such, are presented as derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period. The Company determined the estimated fair value of the Series D Warrants to be $5.7 million as of the issuance date, $5.2 million as of December 31, 2015 and $0.02 million as of June 30, 2016 utilizing a Black Scholes model. The Company relied on Level 1 inputs of the market price for estimating the fair value of the Series E Warrants, and determined the fair value to be $5.3 million as of the issuance date, $4.0 million as of December 31, 2015, and were fully exercised as of June 30, 2016.

In April 2016, the Company issued 10,292,858 Series F Warrants, 6,571,429 Series G Warrants, and 20,585,716 Series H Warrants. Based on the terms of the Series F Warrants, Series G Warrants and the Series H Warrants, the Company determined that each of the Series F Warrants, Series G Warrants and Series H Warrants qualify as a derivative and, as such, are presented as derivative warrant liability on the consolidated balance sheets and recorded at fair value each reporting period.

The Company relied on Level 3 inputs for estimating the fair value of the Series F warrants and utilized a Monte Carlo simulation and determined the estimated fair value to be $2.2 million as of the April 1, 2016 issuance date. The Company relied on Level 3 inputs for estimating the fair value of the Series H warrants and utilized a Black Scholes model and determined the estimated fair value to be $0.3 million as of the April 1, 2016 issuance date. The Company relied on Level 1 inputs for estimating the fair value of the Series G warrants and determined the estimated fair value to be $1.6 million as of the April 1, 2016 issuance date.

The Series F and H warrants were determined to have an estimated fair value of $5.4 million and $0.4 million, respectively, as of June 30, 2016. The Series G warrants were fully exercised and no longer outstanding as of June 30, 2016.

While the Company believes that its valuation methods are appropriate and consistent with other market participants, it recognizes that the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.