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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (USD $)
In Thousands, except Share data
Series B Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income / Loss
Total
Beginning Balance - Amount at Dec. 31, 2011 $ 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 $ 13us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 45,550us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (65,527)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ (2,243)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (22,204)us-gaap_StockholdersEquity
Beginning Balance - Shares at Dec. 31, 2011 3,115us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 13,075us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock-based compensation & options exercised, Shares   32us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock-based compensation & options exercised, Amount     257us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     257us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Shares issued to consultants and other services, Shares   100AMTX_SharesIssuedToConsultantsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued to consultants and other services, Amount     423AMTX_SharesIssuedToConsultantsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     423AMTX_SharesIssuedToConsultantsAmount
Shares issued to secured lender, Shares   1,770AMTX_DebtIssuanceDiscountsSharesIssuedShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued to secured lender, Amount   2AMTX_DebtIssuanceDiscountsSharesIssuedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 10,866AMTX_DebtIssuanceDiscountsSharesIssuedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     10,868AMTX_DebtIssuanceDiscountsSharesIssuedAmount
Issuance and exercise of warrants, Shares   143us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance and exercise of warrants, Amount   1us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,020us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     1,021us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Conversion of related party note, Shares   906AMTX_ConversionOfRelatedPartyNoteShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Conversion of related party note, Amount   1AMTX_ConversionOfRelatedPartyNoteAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 4,107AMTX_ConversionOfRelatedPartyNoteAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     4,108AMTX_ConversionOfRelatedPartyNoteAmount
Beneficial conversion feature on related party note     885us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     885us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
Conversion of Series B preferred to common stock, Shares (17)us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 2us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued in connection to acquisition, Shares   2,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued in connection to acquisition, Amount   2us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 12,511us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     12,513us-gaap_StockIssuedDuringPeriodValueAcquisitions
Other comprehensive loss         (75)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (75)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Net loss       (4,282)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		   (4,282)us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2012 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 19us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 75,619us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (69,809)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (2,318)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 3,514us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2012 3,098us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 18,028us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock-based compensation & options exercised, Shares   26us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Stock-based compensation & options exercised, Amount     1,161us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     1,161us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Shares issued to consultants and other services, Shares   177AMTX_SharesIssuedToConsultantsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued to consultants and other services, Amount     599AMTX_SharesIssuedToConsultantsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     599AMTX_SharesIssuedToConsultantsAmount
Shares issued to secured lender, Shares   987AMTX_DebtIssuanceDiscountsSharesIssuedShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued to secured lender, Amount   1AMTX_DebtIssuanceDiscountsSharesIssuedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 3,616AMTX_DebtIssuanceDiscountsSharesIssuedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     3,617AMTX_DebtIssuanceDiscountsSharesIssuedAmount
Issuance and exercise of warrants, Shares   264us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance and exercise of warrants, Amount     1,482us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     1,482us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Conversion of related party note, Shares   183AMTX_ConversionOfRelatedPartyNoteShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Conversion of related party note, Amount     821AMTX_ConversionOfRelatedPartyNoteAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     821AMTX_ConversionOfRelatedPartyNoteAmount
Conversion of Series B preferred to common stock, Shares (697)us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 70us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Conversion of Series B preferred to common stock, Amount (1)us-gaap_ConversionOfStockAmountConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		         (1)us-gaap_ConversionOfStockAmountConverted1
Issuance of common stock through equity offering, Shares   239us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance of common stock through equity offering, Amount     1,075us-gaap_StockIssuedDuringPeriodValueIssuedForCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     1,075us-gaap_StockIssuedDuringPeriodValueIssuedForCash
Other comprehensive loss         (598)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (598)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Net loss       (24,437)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		   (24,437)us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2013 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 20us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 84,373us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (94,246)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (2,916)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (12,767)us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2013 2,401us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 19,974us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued to consultants and other services, Shares   205AMTX_SharesIssuedToConsultantsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Shares issued to consultants and other services, Amount     715AMTX_SharesIssuedToConsultantsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     715AMTX_SharesIssuedToConsultantsAmount
Issuance and exercise of warrants, Shares   217us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Issuance and exercise of warrants, Amount   1us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,302us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     1,303us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Conversion of related party note, Shares   19AMTX_ConversionOfRelatedPartyNoteShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Conversion of related party note, Amount     47AMTX_ConversionOfRelatedPartyNoteAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     47AMTX_ConversionOfRelatedPartyNoteAmount
Conversion of Series B preferred to common stock, Shares (736)us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 235us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Conversion of Series B preferred to common stock, Amount     643us-gaap_ConversionOfStockAmountConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		     643us-gaap_ConversionOfStockAmountConverted1
Other comprehensive loss         (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Net loss       7,133us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		   7,133us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2014 $ 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 $ 21us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 87,080us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (87,113)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ (2,962)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (2,972)us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2014 1,665us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember		 20,650us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember