Summary of Significant Accounting Policies | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Consolidation The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and entities which it controls. All intercompany balances and transactions have been eliminated for consolidated reporting purposes. Cash and Cash Equivalents Cash and cash equivalents consists of money market funds and demand deposits with financial institutions. The Company considers all highly liquid debt instruments purchased with an original maturity of three months or less to be cash equivalents. Restricted Cash The Company segregates certain cash balances in accordance with lending arrangements and classified restricted cash between current and non-current assets based on the length of time of the restricted use. As of December 31, 2015 and 2014 , current restricted cash amounted to $0 and $12,845 , respectively, which was held in certificates of deposit as pledges for letters of credit issued to support a subsidiary's trade activities and the Company's outstanding tender offer to acquire the remaining interest at Petrotec, see "Note 5 - Acquisitions". Non-current restricted cash consists of a $101,315 certificate of deposit at both December 31, 2015 and 2014 , which was pledged to Bank of America, who issued a letter of credit on the Company's behalf to support the payments on the Company's GOZone Bonds. In addition, non-current restricted cash in the form of certificate of deposit amounts to $4,500 and $3,500 at December 31, 2015 and 2014, respectively, which was pledged to Bank of America, who issued a letter of credit to support a subsidiary's trade activities. For additional information, see "Note 12 - Debt". Marketable Securities The Company’s marketable securities are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, recorded in accumulated other comprehensive income (loss). Realized gains or losses and declines in value judged to be other-than-temporary, if any, on available-for-sale securities are reported in other income, net. The Company evaluates the investments periodically for possible other-than-temporary impairment, specifically contemplating whether a sale of the securities is likely to occur before recovery of the entire amortized cost basis. The Company uses the specific identification method when securities are sold or reclassified out of accumulated other comprehensive income into earnings. The Company considers marketable securities maturing in less than one year as short-term. The Company has no outstanding marketable securities as of December 31, 2015 . Realized gains and losses on available-for-sale securities were minimal for the years ended December 31, 2015 and 2014 . Accounts Receivable Accounts receivable are carried at invoiced amount less allowance for doubtful accounts. Management estimates the allowance for doubtful accounts based on existing economic conditions, the financial conditions of customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after reasonable collection attempts have been exhausted. Activity regarding the allowance for doubtful accounts was as follows: Balance, January 1, 2013 $ 1,972 Amount charged to selling, general and administrative expenses 309 Charge-offs, net of recoveries (157 ) Balance, December 31, 2013 2,124 Amount charged to selling, general and administrative expenses 1,453 Charge-offs, net of recoveries (1,304 ) Balance, December 31, 2014 2,273 Amount charged to selling, general and administrative expenses (803 ) Charge-offs, net of recoveries (119 ) Balance, December 31, 2015 $ 1,351 Inventories Inventories are valued at the lower of cost or net realizable value. Cost is determined based on the first-in, first-out method. There were no lower of cost or market adjustments made to the inventory values reported as of December 31, 2015 and 2014 . Renewable Identification Numbers (RINs) When the Company produces and sells a gallon of biomass-based diesel, 1.5 to 1.7 RINs per gallon are generated. RINs are used to track compliance with Renewable Fuel Standards (RFS2). RFS2 allows the Company to attach between zero and 2.5 RINs to any gallon of biomass-based diesel. As a result, a portion of the selling price for a gallon of biomass-based diesel is generally attributable to RFS2 compliance. However, RINs that the Company generates are a form of government incentive and not a result of the physical attributes of the biomass-based diesel production. Therefore, no cost is allocated to the RIN when it is generated, regardless of whether the RIN is transferred with the biomass-based diesel produced or held by the Company pending attachment to other biomass-based diesel production sales. In addition, the Company also obtains RINs from third parties who have separated the RINs from gallons of biomass-based diesel. From time to time, the Company holds varying amounts of these separated RINs for resale. RINs obtained from third parties are initially recorded at their cost and are subsequently revalued at the lower of cost or market as of the last day of each accounting period and the resulting adjustments are reflected in costs of goods sold for the period. The value of RINs obtained from third parties is reflected in “Prepaid expenses and other assets” on the consolidated balance sheet. The cost of goods sold related to the sale of these RINs is determined using the average cost method, while market prices are determined by RIN values, as reported by the Oil Price Information Service (OPIS). The Company records assets acquired and liabilities assumed through the exchange of non-monetary assets based on the fair value of the assets and liabilities acquired or the fair value of the consideration exchanged, whichever is more readily determinable. Derivative Instruments Derivatives are recorded on the balance sheet at fair value with changes in fair value recognized in current period earnings. The Company did not elect to use hedge accounting for all periods presented. Property, Plant and Equipment Property, plant and equipment is recorded at cost less accumulated depreciation. Maintenance and repairs are expensed as incurred. Depreciation expense is computed on a straight-line method based upon estimated useful lives of the assets. Estimated useful lives are as follows: Automobiles and trucks 5 years Computers and office equipment 5 years Office furniture and fixtures 7 years Machinery and equipment 5-30 years Leasehold improvements the lesser of the lease term or 30 years Buildings and improvements 30-40 years In April 2015, the Company experienced a fire at its Geismar facility, resulting in the shutdown of the facility. The Company estimated fixed assets of approximately $11,027 were impaired as a result of the fire. At December 31, 2015, the Company had received property proceeds of $11,027 from insurance for the property damage. In addition, the Company received approximately $4,293 related to the business interruption portion of the claim reimbursing a portion of lost margin during the repairs of the damages caused by the fire. The proceeds for business interruption were recorded as an increase in biomass-based diesel sales in the Company's Consolidated Statements of Operations. In September 2015, another fire occurred at the Geismar facility. The Company estimated fixed assets of approximately $1,414 were impaired by the September fire. The Company believes it is probable that it will recover all the net book value of the assets damaged by the fire under its insurance policies. As such, a receivable was recorded as an offset to the estimated impairment loss. No impact on earnings was recognized. As of December 31, 2015 , 2014 and 2013 , the Company capitalized interest incurred on debt during the construction of assets of $897 , $1,345 and $335 , respectively. Goodwill Goodwill is tested for impairment annually on July 31 or when impairment indicators exist. Goodwill is allocated and tested for impairment by reporting units. The Company has determined that the reporting units subject to the 2015 goodwill impairment analysis were Biomass-based Diesel; Services; and Renewable Chemicals. The analysis is based on a comparison of the carrying value of the reporting unit to its fair value, determined utilizing both a discounted cash flow methodology and a market comparable methodology. The determination of whether or not the asset has become impaired involves a significant level of judgment in the assumptions underlying the approach used to determine the fair value of the Company’s reporting units, which represented a Level 3 asset measured at fair value on a nonrecurring basis subsequent to its original recognition. Changes in estimates of future cash flows caused by items such as unforeseen events or sustained unfavorable changes in market conditions could negatively affect the fair value of the reporting unit’s goodwill asset and result in an impairment charge. The 2015 annual impairment test determined that the fair value of the Biomass-based Diesel reporting unit exceeded its carrying value by approximately 5% , the Services reporting unit exceeded its carrying value by approximately 21% , and the Renewable Chemicals reporting unit exceeded its carrying value by approximately 12% . Subsequent to the Company's 2015 impairment testing, certain triggering events had occurred. The Company’s common stock price declined significantly during the third quarter and into October, reaching a twelve-month low of $7.06 on November 4, 2015. During the three months ended October 31, 2015, the Company’s common stock traded between $7.25 and $11.18 . The $8.57 average closing common stock price during the three months ended October 31, 2015 compared to an average common stock price of $10.84 during the three months ended July 31, 2015. A sustained decline in the Company’s common stock price and the resulting impact on the Company’s market capitalization is one of several qualitative factors the Company considers each quarter when evaluating whether events or changes in circumstances indicate it is more likely than not that a potential goodwill impairment exists. The Company concluded that the decline in common stock price observed during the third and fourth quarter did represent a sustained decline and that triggering events occurred during this period requiring an interim goodwill impairment test as of October 31, 2015. As such, the Company performed another step-one impairment test of its goodwill assets at October 31, 2015. The result of the step-one evaluation was that the fair value of the Services reporting unit again exceeded its carrying value. However, the fair value of the Biomass-based Diesel and Renewable Chemicals reporting units was lower than their carrying values, primarily due to changes in the weighted average cost of capital. In the step-two analysis for October 31, 2015, the implied fair value of goodwill was determined by assigning the fair value of a reporting unit to all the assets and liabilities of that unit (including any unrecognized intangible assets) as if the reporting unit had been acquired in a business combination. If the carrying amount of reporting unit goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized for that excess. The inputs used to estimate the fair value of the Company’s reporting units are considered Level 3 inputs of the fair value hierarchy and included the following: (1) The Company’s financial projections for its reporting units were based on its analysis of various factors which include, among other things, demands, margins, whether the BTC is reinstated, capital expenditures and economic conditions. Such estimates are consistent with those used in the Company’s budgeting and capital investment reviews, incorporating current market information, historical factors and the regulatory environment; (2) The long-term growth rates assumed for the Company’s reporting units was based on a comparison to similar publicly traded companies, supported by market information obtained from external sources; and (3) The discount rate used to measure the present value of the projected future cash flows was determined by separately estimating borrowing cost of capital, equity cost of capital, and entity structure. Upon completion of step-two of its goodwill impairment test, the Company recorded a non-cash goodwill impairment charge of $175,028 , which is reflected in the Impairment of Goodwill on the Consolidated Statements of Operations. This impairment charge represents a full write-off of goodwill in the Biomass-based Diesel and Renewable Chemicals reporting units. The following table summarizes goodwill for the Company’s reportable segments: Biomass-based Diesel Services Renewable Chemicals Total Beginning balance - January 1, 2014 $ 68,784 $ 16,080 $ — $ 84,864 Acquisitions 68,564 — 34,847 103,411 Ending balance - December 31, 2014 137,348 16,080 34,847 188,275 Finalization of purchase accounting 2,833 — — 2,833 Impairment charge $ (140,181 ) $ — $ (34,847 ) (175,028 ) Ending balance - December 31, 2015 $ — $ 16,080 $ — $ 16,080 Contingent Consideration for Acquisitions Contingent consideration in a business combination is established at the time of the acquisition (See "Note 5 - Acquisitions"). The contingent consideration is adjusted to fair value at each reporting period. The change in fair value is included in change in fair value of contingent consideration on the Consolidated Statements of Operations. Impairment of Long-lived Assets The Company tests its long-lived assets for recoverability when events or circumstances indicate that its carrying amount may not be recoverable. Significant assumptions used in the undiscounted cash flow analysis, when it is required, include the projected demand for biomass-based diesel based on annual renewable fuel volume obligations under the Renewable Fuel Standards (RFS2), the Company's capacity to meet that demand, the market price of biomass-based diesel and the cost of feedstock used in the manufacturing process. For facilities under construction, estimates also include the capital expenditures necessary to complete construction of the plant and the projected costs of financing. There were no asset impairment charges on long-lived assets other than those related to the 2015 Geismar fires of $12,441 , which were fully offset by insurance receipts and/or accounts receivable for insurance coverage, for the years ended December 31, 2015 , 2014 and 2013 . Investments The Company has made investments in several biofuels businesses. These investments are recorded at cost and assessed for impairment at each reporting period. At December 31, 2015 , the Company performed a qualitative and quantitative assessment of the performance of its investments and recorded an impairment charge of $1,915 . This impairment charge was included in Other Income (Expense), on the Consolidated Statements of Operations. There were no impairment charges for the years ended December 31, 2014 and 2013 . Unfavorable Lease Obligation The Company assumed ground and fixture leases as part of certain acquisitions which required the Company to pay above market rentals through the remainder of the lease terms. The unfavorable lease obligation is amortized over the contractual periods the Company is required to make rental payments under the leases. The amount expected to be amortized each year for the remainder of the contracts is $1,828 . Convertible Debt In June 2014, the Company issued $143,750 in convertible senior notes. Applicable authoritative accounting guidance requires that the conversion feature be assigned a fair value and that that feature reduce the initial recorded value of the liability component of the convertible senior notes. This conversion feature is recorded in equity on a net of tax basis. The discount on the liability component is being amortized through interest expense until the maturity date of June 15, 2019. See "Note 12 - Debt" for further descriptions of the transaction. Capped Call Transaction In connection with the issuance of the convertible senior notes, the Company entered into capped call transactions. The purchased capped call transactions were recorded as a reduction to common stock-additional paid-in-capital. Because this was considered to be an equity transaction and qualifies for the derivative scope exception, no future changes in the fair value of the capped call will be recorded by the Company. Share Repurchase Programs In February 2015, the Company's board of directors approved a share repurchase program of up to $30,000 of the Company's shares of Common Stock. The program is in effect through October 31, 2016. Shares may be repurchased from time to time in open market transactions, privately negotiated transactions or by other means. The Company accounts for share repurchases using the cost method. Under this method, the cost of the share repurchase is recorded entirely in treasury stock, a contra equity account. During the year ended December 31, 2015 , the Company repurchased shares of Common Stock in the amount of $23,313 under this share repurchase program. Foreign Currency Transactions and Translation The Company’s reporting and functional currency is U.S. dollars. Monetary assets and liabilities denominated in currencies other than U.S. dollars are remeasured into their respective functional currencies at exchange rates in effect at the balance sheet date. The resulting exchange gain or loss is included in the Company’s Consolidated Statements of Operations as foreign exchange gain (loss) unless the remeasurement gain or loss relates to an intercompany transaction that is of a long-term investment nature and for which settlement is not planned or anticipated in the foreseeable future. Gains or losses arising from translation of such transactions are reported as a component of accumulated other comprehensive income (loss) in the Company’s Consolidated Balance Sheets. The Company translates the assets and liabilities of its foreign subsidiaries from their respective functional currencies to U.S. dollars at the appropriate spot rates as of the balance sheet date. Generally, our foreign subsidiaries use the local currency as their functional currency. Changes in the carrying value of these assets and liabilities attributable to fluctuations in spot rates are recognized in foreign currency translation adjustment, a component of accumulated other comprehensive income (loss) in the Company’s Consolidated Balance Sheets. The other comprehensive loss amounts presented in the Company's Consolidated Statements of Comprehensive Income (Loss) and Consolidated Statements of Redeemable Preferred Stock and Equity mainly include the foreign currency translation adjustment resulting from translating the financial statements of Petrotec AG from Euros to US Dollars, the Company's functional currency. Revenue Recognition The Company recognizes revenues from the following sources: • the sale of biomass-based diesel and its co-products, as well as Renewable Identification Numbers (RINs) and raw material feedstocks, purchased or produced by the Company at owned manufacturing facilities and manufacturing facilities with which the Company has tolling arrangements; • the resale of biomass-based diesel, RINs and raw material feedstocks acquired from third parties; • the sale of petroleum-based heating oil and diesel fuel acquired from third parties, along with the sale of these items further blended with biodiesel produced at wholly owned facilities; • incentives received from federal and state programs for renewable fuels; and • fees received for the marketing and sales of biomass-based diesel produced by third parties and from managing operations of third party facilities. Biomass-based diesel, including RINs, and raw material feedstock revenues are recognized where there is persuasive evidence of an arrangement, delivery has occurred, the price has been fixed or is determinable and collectability can be reasonably assured. Fees received under toll manufacturing agreements with third parties are generally established as an agreed upon amount per gallon of biomass-based diesel produced. The fees are recognized where there is persuasive evidence of an arrangement, delivery has occurred, the price has been fixed or is determinable and collectability can be reasonably assured. Revenues associated with the governmental incentive programs are recognized when the amount to be received is determinable, collectability is reasonably assured and the sale of product giving rise to the incentive has been recognized. The Company received funds from the United States Department of Agriculture (USDA) in the amount of $624 , $600 and $2,813 for the years ended December 31, 2015 , 2014 and 2013 , respectively. The Company records amounts when it has received notification of a payment from the USDA or is in receipt of the funds and records the awards under the Program in "Biodiesel government incentives" as they are closely associated with the Company's biomass-based diesel production activities. On December 18, 2015, President Obama signed into law the Protecting Americans from Tax Hikes Act of 2015, which reinstated and extended a set of tax provisions, including the retroactive reinstatement for 2015 and extension for 2016 of the BTC. All amounts to be received from the government are included within Biomass-based diesel government incentives on the Consolidated Statements of Operations. In addition, given the uncertainty around the reinstatement of the BTC, the Company and other market participants entered into agreements with both customers and vendors throughout the year to handle how any potential future BTC would be captured. The impacts of the agreements with customers are recorded net as adjustments to Biomass-based diesel sales, whereas agreements with vendors are recorded net as adjustments to Biomass-based diesel costs of goods sold on the Consolidated Statements of Operations. As a result of the reinstatement of the BTC, in combination with these agreements, the Company recognized a net benefit of $95,008 and $78,781 for the years ended December 31, 2015 and 2014, respectively. As the BTC was enacted for all of 2013, there were no such agreements. Freight Amounts billed to customers for freight are included in biomass-based diesel sales. Costs incurred for freight are included in costs of goods sold. Advertising Costs Advertising costs are charged to expense as they are incurred. Advertising and promotional expenses were $1,288 , $755 and $648 for the years ended December 31, 2015 , 2014 and 2013 , respectively. Research and Development Research and development (R&D) costs are charged to expense as incurred. In process research and development (IPR&D) assets acquired in connection with acquisitions are recorded on the Consolidated Balance Sheets as intangible assets. Acquired IPR&D is initially assigned an indefinite life and is subject to impairment testing until the completion or abandonment of the associated R&D efforts. If abandoned, the carrying value of the IPR&D asset is expensed. Once the associated R&D efforts are completed, the carrying value of the IPR&D is reclassified as a finite-lived asset and is amortized over its useful life. The Company assessed its indefinite life intangible assets for impairment at December 31, 2015 and 2014. No impairment was identified related to the Company's IPR&D balance at December 31, 2015 and 2014. Employee Benefits Plan The Company sponsors an employee savings plan under Section 401(k) of the Internal Revenue Code. The Company makes matching contributions equal to 50% of the participant’s pre-tax contribution up to a maximum of 6% of the participant’s eligible earnings. Total expense related to the Company’s defined contribution plan was $1,071 , $855 and $533 for the years ended December 31, 2015 , 2014 and 2013 , respectively. Stock-Based Compensation Stock-based compensation expense is measured at the grant-date fair value of the award and recognized as compensation expense over the vesting period. Income Taxes The Company uses the asset and liability method to account for income taxes. Accordingly, deferred income taxes are recognized for differences between the financial statement and tax bases of assets and liabilities at enacted statutory tax rates in effect for the years in which differences are expected to reverse. Changes in tax rates are recognized directly to the income statement as they arise. Consideration is given to positive and negative evidence related to the realization of the deferred tax assets and valuation allowances are established to reduce deferred tax assets to the amounts expected to be realized. Significant judgment is required in making this assessment. For uncertain tax positions, the Company recognizes tax benefits that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50 percent likely to be realized. With regard to non-US subsidiaries, the Company will indefinitely reinvest any future earnings outside of the U.S. and currently does not have any undistributed earnings. Concentrations One customer represented slightly less than 10% of the total consolidated revenues of the Company for the year ended December 31, 2015. This customer accounted for more than 10% of the total consolidated revenues of the Company for the two years ended December 31, 2014 and 2013 . All customer amounts disclosed in the table are related to biomass-based diesel sales: 2015 2014 2013 Customer A $ 114,030 $ 231,780 $ 243,258 The Company maintains cash balances at financial institutions, which may at times exceed the $250 coverage by the U.S. Federal Deposit Insurance Company. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the dates of the financial statements and reported amounts of revenues and expenses during the reporting periods. These estimates are based on information that is currently available to management and on various assumptions that the Company believes to be reasonable under the circumstances. Actual results could differ from those estimates. New Accounting Pronouncements In April 2015, the FASB issued ASU 2015-03 S implifying the Presentation of Debt Issuance Costs . The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance in the ASU is effective for financial statements issued for fiscal years beginning after December 15, 2015 and interim periods within fiscal years beginning after December 15, 2016. The Company has evaluated the impact of this guidance on its consolidated financial statements and elected to early adopt the guidance in the year ended December 31, 2015. Early adoption of the guidance did not have any material impact on the Company's consolidated financial statements for the year ended December 31, 2015. Certain amounts on the consolidated financial statements have been reclassified to conform to the current year's presentation as a result of early adopting the guidance. In July 2015, the FASB issued ASU 2015-11, S implifying the Measurement of Inventory , which requires entities to measure most inventory “at the lower of cost and net realizable value,” thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. The guidance is effective prospectively for annual periods beginning after December 15, 2016, and interim periods therein. The Company has evaluated the impact of this guidance on its consolidated financial statements and elected to early adopt the guidance in the year ended December 31, 2015 given the level and nature of its inventory turnover. Early adoption of the guidance did not have any material impact on the Company's consolidated financial statements for the year ended December 31, 2015. In July 2015, the FASB decided to defer by one year the effective dates of the new revenue recognition standard as provided by the ASU 2014-09, Revenue from Contracts with Customers: Summary and Amendments that Create Revenue from Contracts with Customers and Other Assets and Deferred Costs—Contracts with Customers . Early adoption is permitted for all entities, but not before the original public entity effective date. For public companies, the update will now be effective for interim and annual periods beginning after December 15, 2017. The Company is currently evaluating the impact that this guidance will have on its consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting Measurement-Period Adjustments that eliminates the requirement that an acquirer in a business combination account for measurement-period adjustments retrospectively. Instead, a measurement-period adjustment will be recognized in the period in which it determines the amount of the adjustment. The guidance is effective for public business entities for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In November 2015, the FASB issued ASU 2015-17, Income Taxes, Balance Sheet Classification of Deferred Taxes , requiring entities to classify all deferred tax assets and liabilities as noncurrent on the balance sheet instead of separating deferred taxes into current and noncurrent accounts. All valuation allowances are required to be classified as noncurrent. The guidance is effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has evaluated the impact of this guidance on its consolidated financial statements and elected to early adopt the guidance for the year ended December 31, 2015. In January 2016, the FASB issued ASU 2016-01, Financial instruments - Overall - Recognition and Measurement of Financial Assets and Financial Liabilities , which requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and recognize any changes in fair value in net income unless the investment qualify for the new practicability exception. The guidance is effective for calendar-year public entities beginning in 2018. The Company is still evaluating the impact of this guidance, but does not expect it to have any material impact on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases , that requires lessees to put most leases on their balance sheets but recognize expenses on their income statements in a manner similar to today’s accounting. The guidance also eliminates today’s real estate-specific provisions for all entities. For lessors, the guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. The guidance is effective for calendar-year public entities beginning in 2019. The Company is still evaluating the impact of this guidance on its consolidated financial statements. |