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16. Income Tax (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) at the federal statutory rate |  |  |  |  |  |  |  |  | $ 2,427 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (8,307)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (1,824)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax expense (benefit) |  |  |  |  |  |  |  |  | 1,089 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (695)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (476)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign tax rate differential |  |  |  |  |  |  |  |  | 302 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | 220 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | 475 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Stock-based compensation |  |  |  |  |  |  |  |  | 204 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 556 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 382 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Interest Expense |  |  |  |  |  |  |  |  | 53 AMTX_IncomeTaxReconciliationInterestExpense | 328 AMTX_IncomeTaxReconciliationInterestExpense | 430 AMTX_IncomeTaxReconciliationInterestExpense
Loss on Debt Extinguishment |  |  |  |  |  |  |  |  | 0 AMTX_IncomeTaxReconciliationLossOnDebtExtinguishment | 1,162 AMTX_IncomeTaxReconciliationLossOnDebtExtinguishment | 3,708 AMTX_IncomeTaxReconciliationLossOnDebtExtinguishment
Gain on Bargain Purchase |  |  |  |  |  |  |  |  | 0 AMTX_IncomeTaxReconciliationGainOnBargainPurchase | 0 AMTX_IncomeTaxReconciliationGainOnBargainPurchase | (16,728)AMTX_IncomeTaxReconciliationGainOnBargainPurchase
Other |  |  |  |  |  |  |  |  | (147)us-gaap_IncomeTaxReconciliationDeductionsOther | 69 us-gaap_IncomeTaxReconciliationDeductionsOther | (160)us-gaap_IncomeTaxReconciliationDeductionsOther
Cilion Transactions |  |  |  |  |  |  |  |  | 0 AMTX_IncomeTaxReconciliationCilionTransactionCosts | 0 AMTX_IncomeTaxReconciliationCilionTransactionCosts | 302 AMTX_IncomeTaxReconciliationCilionTransactionCosts
Credits |  |  |  |  |  |  |  |  | (25)us-gaap_IncomeTaxReconciliationTaxCredits | 0 us-gaap_IncomeTaxReconciliationTaxCredits | (150)us-gaap_IncomeTaxReconciliationTaxCredits
Valuation Allowance |  |  |  |  |  |  |  |  | (3,897)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 6,673 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 12,960 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Tax Expense | $ 0 us-gaap_IncomeTaxExpenseBenefit | $ 0 us-gaap_IncomeTaxExpenseBenefit | $ 0 us-gaap_IncomeTaxExpenseBenefit | $ 6 us-gaap_IncomeTaxExpenseBenefit | $ 0 us-gaap_IncomeTaxExpenseBenefit | $ 0 us-gaap_IncomeTaxExpenseBenefit | $ 0 us-gaap_IncomeTaxExpenseBenefit | $ 6 us-gaap_IncomeTaxExpenseBenefit | $ 6 us-gaap_IncomeTaxExpenseBenefit | $ 6 us-gaap_IncomeTaxExpenseBenefit | $ (1,081)us-gaap_IncomeTaxExpenseBenefit
Effective Tax Rate |  |  |  |  |  |  |  |  | 0.08%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (0.02%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | 20.16%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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