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10. Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation [Abstract] |
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 | ) |  |  | 7.32 |
Balance as of December 31, 2017 |  |  | 196 |  |  |  | 2,189 |  |  | $ | 2.70 |
Authorized |  |  | 655 |  |  |  | - |  |  |  | - |
Granted |  |  | (1,148 | ) |  |  | 1,148 |  |  |  | 1.07 |
Exercised |  |  | - |  |  |  | (2 | ) |  |  | 0.67 |
Forfeited/expired |  |  | 446 |  |  |  | (446 | ) |  |  | 4.35 |
Balance as of December 31, 2018 |  |  | 149 |  |  |  | 2,889 |  |  | $ | 1.80 |
Schedule of weighted average fair value calculations for options |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Remaining Contractual Term (In Years) |  |  | Average Intrinsic Value1 |
2018 |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 1,923 |  |  | $ | 2.01 |  |  |  | 7.34 |  |  | $ | - |
Unvested |  |  | 966 |  |  |  | 1.38 |  |  |  | 8.81 |  |  |  | - |
Total |  |  | 2,889 |  |  | $ | 1.80 |  |  |  | 7.80 |  |  | $ | - |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 1,515 |  |  | $ | 2.94 |  |  |  | 5.83 |  |  | $ | - |
Unvested |  |  | 674 |  |  |  | 2.16 |  |  |  | 8.62 |  |  |  | - |
Total |  |  | 2,189 |  |  | $ | 2.70 |  |  |  | 6.68 |  |  | $ | - |
——————— (1) Intrinsic value based on the $0.61 and $0.55 closing price of Aemetis stock on December 31, 2018 and 2017 respectively, as reported on the NASDAQ Exchange.
Schedule of assumptions for weighted-average fair value calculations for options granted |
Description |  | For the year ended December 31, |
|  | 2018 |  |  | 2017 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 2.71 | % |  |  | 2.22 | %
Expected volatility |  |  | 82.99 | % |  |  | 76.96 | %
Expected life (years) |  |  | 6.48 |  |  |  | 6.42 |
Market value per share on grant date |  | $ | 1.07 |  |  | $ | 1.41 |
Fair value per share on grant date |  | $ | 0.79 |  |  | $ | 0.99 |
Schedule of assumptions for remeasurement of SARs |
Description |  | At December 31, 2018 |
Risk-free interest rate |  |  | 2.60 | %
Expected volatility |  |  | 125 | %
Market value per share on grant date |  | $ | 0.61 |
Fair value per share on grant date |  | $ | 1.08 |
Fair value of warrant liability |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
2018 |  |  |  |  |  |  |  |  |  |  |  |
SARs liability |  | $ | 1,132 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,132 |
Activity of level 3 liabilities |
|  | SARs Liability Balance |
Balance on August 23, 2018 |  | $ | 1,277 |
Related change in fair value |  |  | (145 | )
Balance as of December 31, 2018 |  | $ | 1,132 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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