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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 |

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