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9. Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Weighted average dilutive share equivalents from common warrants |
Schedule of options granted under employee stock plans |
|  | Shares Available for Grant |  |  | Number of Shares Outstanding |  |  | Weighted-Average Exercise Price |
Balance as of December 31, 2016 |  |  | 98 |  |  |  | 1,632 |  |  | $ | 4.37 |
Authorized |  |  | 655 |  |  |  | - |  |  |  | - |
Granted |  |  | (899 | ) |  |  | 899 |  |  |  | 1.41 |
Forfeited/expired |  |  | 342 |  |  |  | (342 | ) |  |  | - |
Balance as of December 31, 2017 |  |  | 196 |  |  |  | 2,189 |  |  | $ | 2.70 |
Schedule of weighted average fair value calculations for options |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Remaining Contractual Term (In Years) |  |  | Average Intrinsic Value (1) |
2017 |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 1,515 |  |  | $ | 2.94 |  |  |  | 5.83 |  |  | $ | - |
Unvested |  |  | 674 |  |  |  | 2.16 |  |  |  | 8.62 |  |  |  | - |
Total |  |  | 2,189 |  |  | $ | 2.70 |  |  |  | 6.68 |  |  | $ | - |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 977 |  |  | $ | 5.45 |  |  |  | 3.28 |  |  | $ | - |
Unvested |  |  | 655 |  |  |  | 2.76 |  |  |  | 8.66 |  |  |  | - |
Total |  |  | 1,632 |  |  | $ | 4.37 |  |  |  | 5.44 |  |  | $ | - |
——————— (1) Intrinsic value based on the $0.55 and $1.39 closing price of Aemetis stock on December 31, 2017 and 2016 respectively, as reported on the NASDAQ Exchange.
Schedule of assumptions for weighted-average fair value calculations for options granted |
|  | For the years ended December 31, |
Description |  | 2017 |  |  | 2016 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 2.22 | % |  |  | 1.66 | %
Expected volatility |  |  | 76.96 | % |  |  | 77.69 | %
Expected life (years) |  |  | 6.42 |  |  |  | 6.99 |
Market value per share on grant date |  | $ | 1.41 |  |  | $ | 2.52 |
Fair value per share on grant date |  | $ | 0.99 |  |  | $ | 1.79 |

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