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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities:      
Net income (loss) $ 7,133us-gaap_NetIncomeLoss $ (24,437)us-gaap_NetIncomeLoss $ (4,282)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activitites:      
Share-based compensation 624us-gaap_ShareBasedCompensation 1,760us-gaap_ShareBasedCompensation 686us-gaap_ShareBasedCompensation
Stock issued in connection with consultant services 645us-gaap_StockIssuedDuringPeriodValueIssuedForServices 0us-gaap_StockIssuedDuringPeriodValueIssuedForServices 0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Depreciation 4,681us-gaap_Depreciation 4,636us-gaap_Depreciation 3,042us-gaap_Depreciation
Inventory provision 0us-gaap_InventoryWriteDown 0us-gaap_InventoryWriteDown 105us-gaap_InventoryWriteDown
Debt related amortization expense 6,038us-gaap_AmortizationOfFinancingCostsAndDiscounts 12,468us-gaap_AmortizationOfFinancingCostsAndDiscounts 7,544us-gaap_AmortizationOfFinancingCostsAndDiscounts
Intangibles and other amortization expense 126us-gaap_AmortizationOfIntangibleAssets 254us-gaap_AmortizationOfIntangibleAssets 0us-gaap_AmortizationOfIntangibleAssets
Change in fair value of warrant liability 48us-gaap_FairValueAdjustmentOfWarrants (197)us-gaap_FairValueAdjustmentOfWarrants 97us-gaap_FairValueAdjustmentOfWarrants
Loss on extinguishment of debt 1,346us-gaap_GainsLossesOnExtinguishmentOfDebt 3,709us-gaap_GainsLossesOnExtinguishmentOfDebt 9,069us-gaap_GainsLossesOnExtinguishmentOfDebt
(Gain) loss on sale/ Disposal of assets 119us-gaap_GainLossOnDispositionOfAssets1 (329)us-gaap_GainLossOnDispositionOfAssets1 (350)us-gaap_GainLossOnDispositionOfAssets1
Gain on acquisition bargain purchase 0us-gaap_OtherNoncashIncome 0us-gaap_OtherNoncashIncome (42,336)us-gaap_OtherNoncashIncome
Deferred tax asset 0us-gaap_DeferredIncomeTaxExpenseBenefit 0us-gaap_DeferredIncomeTaxExpenseBenefit (1,085)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:      
Accounts receivable 1,498us-gaap_IncreaseDecreaseInReceivables (1,487)us-gaap_IncreaseDecreaseInReceivables 3,114us-gaap_IncreaseDecreaseInReceivables
Inventory (457)us-gaap_IncreaseDecreaseInInventories 211us-gaap_IncreaseDecreaseInInventories (740)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses (311)us-gaap_IncreaseDecreaseInPrepaidExpense 14us-gaap_IncreaseDecreaseInPrepaidExpense 148us-gaap_IncreaseDecreaseInPrepaidExpense
Other current assets and other assets (187)us-gaap_IncreaseDecreaseInOtherCurrentAssets (694)us-gaap_IncreaseDecreaseInOtherCurrentAssets 476us-gaap_IncreaseDecreaseInOtherCurrentAssets
Accounts payable (879)us-gaap_IncreaseDecreaseInAccountsPayable (5,412)us-gaap_IncreaseDecreaseInAccountsPayable 800us-gaap_IncreaseDecreaseInAccountsPayable
Accrued interest expense and fees, net of payments 3,124us-gaap_IncreaseDecreaseInInterestPayableNet 7,007us-gaap_IncreaseDecreaseInInterestPayableNet 4,006us-gaap_IncreaseDecreaseInInterestPayableNet
Other liabilities (2,956)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 814us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 2,775us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by (used in) operating activities 20,592us-gaap_NetCashProvidedByUsedInOperatingActivities (1,683)us-gaap_NetCashProvidedByUsedInOperatingActivities (16,931)us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:      
Capital expenditures (1,965)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,276)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,368)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from the sale of assets 0us-gaap_ProceedsFromSaleOfLandHeldForUse 1,500us-gaap_ProceedsFromSaleOfLandHeldForUse 1,404us-gaap_ProceedsFromSaleOfLandHeldForUse
Acquisition of Cilion 0us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates 0us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates (16,500)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
Net cash provided by (used in) investing activities (1,965)us-gaap_NetCashProvidedByUsedInInvestingActivities 224us-gaap_NetCashProvidedByUsedInInvestingActivities (16,464)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:      
Proceeds from borrowings 9,884AMTX_ProceedsFromBorrowingUnderSecuredDebtFacilities 10,541AMTX_ProceedsFromBorrowingUnderSecuredDebtFacilities 47,165AMTX_ProceedsFromBorrowingUnderSecuredDebtFacilities
Repayments of borrowings (32,688)AMTX_RepaymentsOfBorrowingUnderSecuredDebtFacilities (5,374)AMTX_RepaymentsOfBorrowingUnderSecuredDebtFacilities (13,830)AMTX_RepaymentsOfBorrowingUnderSecuredDebtFacilities
Issuance of common stock for services, option and warrant exercises 5us-gaap_ProceedsFromWarrantExercises 1,083us-gaap_ProceedsFromWarrantExercises 1us-gaap_ProceedsFromWarrantExercises
Payment of debt gaurantee fee (172)AMTX_PaymentOfDebtGauranteeFee 0AMTX_PaymentOfDebtGauranteeFee 0AMTX_PaymentOfDebtGauranteeFee
Payment of financing costs (255)us-gaap_PaymentsOfFinancingCosts 0us-gaap_PaymentsOfFinancingCosts 0us-gaap_PaymentsOfFinancingCosts
Net cash provided by (used in) financing activities (23,226)us-gaap_NetCashProvidedByUsedInFinancingActivities 6,250us-gaap_NetCashProvidedByUsedInFinancingActivities 33,336us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents 5us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (156)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 101us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net cash and cash equivalents (decrease) increase for period (4,594)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 4,635us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 42us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 4,926us-gaap_CashAndCashEquivalentsAtCarryingValue 291us-gaap_CashAndCashEquivalentsAtCarryingValue 249us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 332us-gaap_CashAndCashEquivalentsAtCarryingValue 4,926us-gaap_CashAndCashEquivalentsAtCarryingValue 291us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information, cash paid:      
Interest payments 6,824us-gaap_InterestPaidNet 4,522us-gaap_InterestPaidNet 2,085us-gaap_InterestPaidNet
Income tax expense (benefit) 6us-gaap_IncomeTaxesPaidNet 6us-gaap_IncomeTaxesPaidNet 4us-gaap_IncomeTaxesPaidNet
Supplemental disclosures of cash flow information, non-cash transactions:      
Proceeds from exercise of stock options applied to accounts payable 16AMTX_ProceedsFromExerciseOfStockOptionsAppliedToAccountsPayable 0AMTX_ProceedsFromExerciseOfStockOptionsAppliedToAccountsPayable 0AMTX_ProceedsFromExerciseOfStockOptionsAppliedToAccountsPayable
Issuance of warrants to subordinated debt holders 1,301AMTX_IssuanceOfWarrantsToSubordinatedDebtHolders 1,127AMTX_IssuanceOfWarrantsToSubordinatedDebtHolders 0AMTX_IssuanceOfWarrantsToSubordinatedDebtHolders
Transfer between debt and other liabilities 438AMTX_TransferBetweenDebtAndOtherLiabilities 0AMTX_TransferBetweenDebtAndOtherLiabilities 0AMTX_TransferBetweenDebtAndOtherLiabilities
Stock issued in connection with services 715AMTX_StockIssuedInConnectionWithServices 0AMTX_StockIssuedInConnectionWithServices 0AMTX_StockIssuedInConnectionWithServices
Payments of principal, fees and interest paid in stock 0AMTX_PaymentOfPrincipalFeesAndInterestByIssuanceOfStock 3,616AMTX_PaymentOfPrincipalFeesAndInterestByIssuanceOfStock 11,886AMTX_PaymentOfPrincipalFeesAndInterestByIssuanceOfStock
Issuance of shares to related party for repayment of line of credit 0AMTX_IssuanceOfSharesToRelatedPartyForRepaymentOfLineOfCredit 822AMTX_IssuanceOfSharesToRelatedPartyForRepaymentOfLineOfCredit 4,107AMTX_IssuanceOfSharesToRelatedPartyForRepaymentOfLineOfCredit
Issuance of warrants to non-employees to secure procurement and working capital 0AMTX_IssuanceOfWarrantsToNonemployeesToSecureProcurementAndWorkingCapitalAgreement 336AMTX_IssuanceOfWarrantsToNonemployeesToSecureProcurementAndWorkingCapitalAgreement 0AMTX_IssuanceOfWarrantsToNonemployeesToSecureProcurementAndWorkingCapitalAgreement
Other asset transferred to related party 0AMTX_OtherAssetTransferredToRelatedParty 170AMTX_OtherAssetTransferredToRelatedParty 0AMTX_OtherAssetTransferredToRelatedParty
Warrant liability transferred to equity upon exercise 0AMTX_WarrantLiabilityTransferredToEquityUponExercise 1,007AMTX_WarrantLiabilityTransferredToEquityUponExercise 0AMTX_WarrantLiabilityTransferredToEquityUponExercise
Exercise of conversion feature on note to equity 47AMTX_ExerciseOfConversionFeatureOnNoteToEquity 0AMTX_ExerciseOfConversionFeatureOnNoteToEquity 0AMTX_ExerciseOfConversionFeatureOnNoteToEquity
Issuance of shares for acquisition 0AMTX_IssuanceOfSharesForAcquisition 0AMTX_IssuanceOfSharesForAcquisition 12,511AMTX_IssuanceOfSharesForAcquisition
Beneficial conversion discount on related party debt 0AMTX_BeneficialConversionDiscountOnRelatedPartyDebt 0AMTX_BeneficialConversionDiscountOnRelatedPartyDebt 885AMTX_BeneficialConversionDiscountOnRelatedPartyDebt
Seller note payable at fair value 0AMTX_SellerNotePayableAtFairValue 0AMTX_SellerNotePayableAtFairValue 3,584AMTX_SellerNotePayableAtFairValue
Settlement of accounts payable through transfer of equipment $ 99AMTX_SettlementOfAccountsPayableThroughTransferOfEquipment $ 0AMTX_SettlementOfAccountsPayableThroughTransferOfEquipment $ 0AMTX_SettlementOfAccountsPayableThroughTransferOfEquipment