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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Activities:    
Consolidated net loss $ (4,509)us-gaap_ProfitLoss $ (8,817)us-gaap_ProfitLoss
Adjustments to reconcile consolidated net loss to net cash provided by operating activities:    
Fair value adjustments 173us-gaap_FairValueAdjustmentOfWarrants 35,844us-gaap_FairValueAdjustmentOfWarrants
Depreciation and amortization of intangibles 3,409us-gaap_DepreciationAndAmortization 3,173us-gaap_DepreciationAndAmortization
Deferred income taxes 0us-gaap_DeferredIncomeTaxExpenseBenefit 3,270us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of debt discount 44us-gaap_AmortizationOfDebtDiscountPremium 1,557us-gaap_AmortizationOfDebtDiscountPremium
Non-cash compensation 506us-gaap_OtherNoncashExpense 367us-gaap_OtherNoncashExpense
Amortization of deferred financing fees 60us-gaap_AmortizationOfFinancingCostsAndDiscounts 112us-gaap_AmortizationOfFinancingCostsAndDiscounts
Inventory valuation 0us-gaap_InventoryWriteDown 97us-gaap_InventoryWriteDown
Loss (gain) on derivatives 189us-gaap_DerivativeGainLossOnDerivativeNet (70)us-gaap_DerivativeGainLossOnDerivativeNet
Bad debt expense 0us-gaap_ProvisionForDoubtfulAccounts (34)us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities:    
Accounts receivable 7,270us-gaap_IncreaseDecreaseInAccountsReceivable (16,096)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 709us-gaap_IncreaseDecreaseInInventories (5,008)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (2,857)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 82us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid inventory 3,164us-gaap_IncreaseDecreaseInOtherCurrentAssets 2,974us-gaap_IncreaseDecreaseInOtherCurrentAssets
Accounts payable and accrued expenses (832)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 5,425us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities 7,326us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 22,876us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing Activities:    
Additions to property and equipment (8,178)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,833)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (8,178)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,833)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing Activities:    
Proceeds from exercise of warrants 191us-gaap_ProceedsFromWarrantExercises 12,130us-gaap_ProceedsFromWarrantExercises
Net proceeds from (payments on) Kinergy's line of credit (17,530)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit 4,065us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Principal Payments on Plant Owners' borrowings 0us-gaap_RepaymentsOfOtherDebt (19,378)us-gaap_RepaymentsOfOtherDebt
Principal Payments on senior notes 0us-gaap_RepaymentsOfSeniorDebt (13,007)us-gaap_RepaymentsOfSeniorDebt
Principal payments on capital leases (1,307)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations (1,096)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Principal payments on related party note 0us-gaap_RepaymentsOfRelatedPartyDebt (750)us-gaap_RepaymentsOfRelatedPartyDebt
Preferred stock dividends paid (312)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (312)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Net cash used in financing activities (18,958)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (18,348)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents (19,810)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,695us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 62,084us-gaap_CashAndCashEquivalentsAtCarryingValue 5,151us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 42,274us-gaap_CashAndCashEquivalentsAtCarryingValue 7,846us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Information:    
Interest paid 969us-gaap_InterestPaidNet 2,712us-gaap_InterestPaidNet
Noncash financing and investing activities:    
Reclass of warrant liability to equity upon warrant exercises $ 39peix_ReclassOfWarrantLiabilityToEquityUponWarrantExercises $ 11,377peix_ReclassOfWarrantLiabilityToEquityUponWarrantExercises