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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities:    
Net income (loss) $ (8,643)us-gaap_NetIncomeLoss $ 7,687us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activitites:    
Share-based compensation 153us-gaap_ShareBasedCompensation 131us-gaap_ShareBasedCompensation
Depreciation 1,195us-gaap_Depreciation 1,152us-gaap_Depreciation
Debt related amortization expense 1,723us-gaap_AmortizationOfDebtDiscountPremium 2,118us-gaap_AmortizationOfDebtDiscountPremium
Intangibles and other amortization expense 32us-gaap_AmortizationOfIntangibleAssets 32us-gaap_AmortizationOfIntangibleAssets
Change in fair value of warrant liability (29)us-gaap_FairValueAdjustmentOfWarrants 48us-gaap_FairValueAdjustmentOfWarrants
Loss on extinguishment of debt 330us-gaap_GainsLossesOnExtinguishmentOfDebt 115us-gaap_GainsLossesOnExtinguishmentOfDebt
Changes in operating assets and liabilities:    
Accounts receivable (385)us-gaap_IncreaseDecreaseInReceivables 468us-gaap_IncreaseDecreaseInReceivables
Inventory (117)us-gaap_IncreaseDecreaseInInventories 50us-gaap_IncreaseDecreaseInInventories
Prepaid expenses 490us-gaap_IncreaseDecreaseInPrepaidExpense (18)us-gaap_IncreaseDecreaseInPrepaidExpense
Other current assets and other assets 19us-gaap_IncreaseDecreaseInOtherCurrentAssets (399)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Accounts payable 560us-gaap_IncreaseDecreaseInAccountsPayable (1,453)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued interest expense and fees, net of payments 2,421us-gaap_IncreaseDecreaseInInterestPayableNet 145us-gaap_IncreaseDecreaseInInterestPayableNet
Other liabilities 563us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 1,178us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Net cash provided by (used in) operating activities (1,688)us-gaap_NetCashProvidedByUsedInOperatingActivities 11,254us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Capital expenditures (14)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (247)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (14)us-gaap_NetCashProvidedByUsedInInvestingActivities (247)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Proceeds from borrowings 20,032us-gaap_ProceedsFromIssuanceOfDebt 960us-gaap_ProceedsFromIssuanceOfDebt
Repayments of borrowings (13,173)us-gaap_RepaymentsOfBankDebt (9,581)us-gaap_RepaymentsOfBankDebt
Issuance of common stock for services, option and warrant exercises 21us-gaap_ProceedsFromWarrantExercises   
Net cash provided by (used in) financing activities 6,880us-gaap_NetCashProvidedByUsedInFinancingActivities (8,621)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (1)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 6us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net cash and cash equivalents increase for period 5,177us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,392us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 332us-gaap_CashAndCashEquivalentsAtCarryingValue 4,926us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 5,509us-gaap_CashAndCashEquivalentsAtCarryingValue 7,318us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information, cash paid:    
Interest payments 141us-gaap_InterestPaid 2,646us-gaap_InterestPaid
Income tax expense 6us-gaap_IncomeTaxesPaidNet 6us-gaap_IncomeTaxesPaidNet
Supplemental disclosures of cash flow information, non-cash transactions:    
Proceeds from exercise of stock options applied to accounts payable 21AMTX_ProceedsFromExerciseOfStockOptionsAppliedToAccountsPayable 16AMTX_ProceedsFromExerciseOfStockOptionsAppliedToAccountsPayable
Issuance of warrants to subordinated debt holders 668AMTX_IssuanceOfWarrantsToSubordinatedDebtHolders 95AMTX_IssuanceOfWarrantsToSubordinatedDebtHolders
Transfer between debt and other liabilities    438AMTX_TransferBetweenDebtAndOtherLiabilities
Stock issued in connection with services    506AMTX_StockIssuedInConnectionWithServices
Repurchase of common stock on revolver loan advance $ 5,522AMTX_RepurchaseOfCommonStockOnRevolverLoanAdvance