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12. Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Stockholders' deficit:  
Summary of options granted under the employee stock plans
    Shares Available     Number of     Weighted-Average  
    for Grant     Shares Outstanding     Exercise Price  
Balance as of December 31, 2010     10,167       5,780,977     $ 1.02  
Authorized     959,290       —       —  
Merger with Zymetis, Inc. Plan     323,817       1,421,183       0.41  
Exercised     —       (35,585 )     0.06  
Forfeited/Expired     362,874       (362,874 )     0.20  
Balance as of December 31, 2011     1,656,148       6,803,701       0.94  
Authorized     1,000,000       —       —  
Granted     (2,555,000 )     2,555,000       0.55  
Exercised     —       (321,965 )     0.23  
Forfeited/Expired     1,511,902       (1,511,902 )     2.17  
Balance as of December 31, 2012     1,611,134       7,524,834     $ 0.59  
Aemetis Stock Option Plans Vested and Unvested
   

Number

of Shares

     Weighted Average Exercise Price     Remaining Contractual Term (In Years)     Average Intrinsic Value1  
2012                        
Vested     5,061,850     $ 0.63       2.21     $ 2,081,910  
Unvested     2,462,984       0.52       4.69       435,197  
Total     7,524,834     $ 0.59       3.02     $ 2,517,107  
                                 
2011                                
Vested     5,960,116     $ 1.05       2.26     $ 1,986,222  
Unvested     843,585       0.17       3.16       445,606  
Total     6,803,701     $ 0.94       2.37     $ 2,431,828  
Schedule of assumptions for weighted-average fair value calculations for options granted
    Fiscal Year Ended December 31  
    2012     2011  
Dividend-yield     0 %   0 %
Risk-free interest rate     0.28-0.38 %   0.20-1.80 % 
Expected volatility     79.08 %     90.38-103.22 %
Expected life (years)     2.0-3.0       0.2-4.0  
Weighted average fair value per share of common stock   $ 0.26     $ 0.10  
Schedule of Outside Company Stock Plan
    Number of Shares     Weighted Average Exercise Price     Remaining Contractual Term (In Years)     Average Intrinsic Value2  
2012                        
Vested     402,500     $ 0.55       4.85     $ 60,375  
Unvested     575,000       0.55       4.85       86,250  
Total     977,500     $ 0.55       4.85     $ 146,625