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1. Nature of Activities and Summary of Significant Accounting Policies (Details 1)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nature Of Activities And Summary Of Significant Accounting Policies Details 1      
Series B preferred    2,401AMTX_AemetisSeriesBPreferredInstant 3,098AMTX_AemetisSeriesBPreferredInstant
Common stock options and warrants 30AMTX_AemetisCommonStockOptionsAndWarrantsInstant 1,480AMTX_AemetisCommonStockOptionsAndWarrantsInstant 1,031AMTX_AemetisCommonStockOptionsAndWarrantsInstant
Convertible promissory note    19AMTX_ConvertiblePromissoryNote 18AMTX_ConvertiblePromissoryNote
Total number of potentially dilutive shares excluded from the basic and diluted net income (loss) per share calculation 30AMTX_TotalNumberOfPotentiallyDilutiveSharesExcludedFromDilutedNetIncomelossPerShareCalculation 3,900AMTX_TotalNumberOfPotentiallyDilutiveSharesExcludedFromDilutedNetIncomelossPerShareCalculation 4,147AMTX_TotalNumberOfPotentiallyDilutiveSharesExcludedFromDilutedNetIncomelossPerShareCalculation