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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Intangible assets, net of accumulated amortization $ 264AMTX_IntangibleAssetsNetOfAccumulatedAmortization $ 184AMTX_IntangibleAssetsNetOfAccumulatedAmortization
Series B Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Series B Preferred stock, authorized 7,235us-gaap_PreferredStockSharesAuthorized 7,235us-gaap_PreferredStockSharesAuthorized
Series B Preferred stock, shares issued 1,665us-gaap_PreferredStockSharesIssued 2,401us-gaap_PreferredStockSharesIssued
Series B Preferred stock, shares outstanding 1,665us-gaap_PreferredStockSharesOutstanding 2,401us-gaap_PreferredStockSharesOutstanding
Aggregate Liquidation Preference $ 4,995AMTX_AggregateLiquidationPreference $ 7,203AMTX_AggregateLiquidationPreference
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 40,000us-gaap_CommonStockSharesAuthorized 40,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 20,650us-gaap_CommonStockSharesIssued 19,974us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 20,650us-gaap_CommonStockSharesOutstanding 19,974us-gaap_CommonStockSharesOutstanding