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12. Stock-Based Compensation (Tables) | 12 Months Ended
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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 |

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