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10. Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2015
Stockholders' deficit: |
10. Stock Based Compensation | Common Stock Reserved for Issuance Aemetis authorized the issuance of 1.2 million shares of common stock under its Zymetis 2006 Stock Plan and Amended and Restated 2007 Stock Plan (together, the “Company Stock Plans”), which includes both incentive and non-statutory stock options. These options generally expire five years from the date of grant with a general vesting term of 1/12th every three months and are exercisable at any time after vesting subject to continuation of employment. Non-Plan Stock Options In November 2012, the Company issued 98 thousand stock options to board members and consultants outside of any Company stock option plan. None of the non-plan options have been exercised. As of March 31, 2015, all options were vested. 9 thousand options had been exercised at a weighted average exercise price of $5.50 and 89 thousand options were outstanding as of March 31, 2015. Inducement Equity Plan Options In March 2015, the Board of Directors of the Company approved an Inducement Equity Plan authorizing the issuance of 100,000 non-statutory stock options to purchase common stock. The Company issued 25 thousand options during March 2015 with a three year vesting period and five year term at a weighted average exercise price of $3.88. As of March 31, 2015, the 25 thousand options were outstanding. The following is a summary of options granted under the all above stock plans:
|  | Shares Available for Grant |  |  | Number of Shares Outstanding |  |  | Weighted-Average Exercise Price |
Balance as of December 31, 2014 |  |  | 5 |  |  |  | 1,015 |  |  | $ | 5.51 |
Authorized |  |  | 200 |  |  |  | — |  |  |  | — |
Granted |  |  | (25 | ) |  |  | 25 |  |  |  | 3.88 |
Exercised |  |  | - |  |  |  | (71 | ) |  |  | 2.12 |
Forfeited/expired |  |  | 43 |  |  |  | (43 | ) |  |  | 2.12 |
Balance as of March 31, 2015 |  |  | 223 |  |  |  | 926 |  |  | $ | 5.89 |
Stock-based compensation for employees Stock-based compensation is accounted for in accordance with the provisions of ASC 718, Compensation-Stock Compensation, which requires the measurement and recognition of compensation expense for all stock-based awards made to employees and directors based on estimated fair values on the grant date. We estimate the fair value of stock-based awards on the date of grant using the Black-Scholes option pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods using the straight-line method. For the three months ended March 31, 2015 and 2014, the Company recorded stock compensation expense in the amount of $152 thousand and $128 thousand, respectively. Valuation and Expense Information All issuances of stock options or other issuances of equity instruments to employees as the consideration for services received by us are accounted for based on the fair value of the equity instrument issued. The fair value of options granted to employees is estimated on the grant date using the Black-Scholes option valuation model. This valuation model for stock based compensation expense requires us to make assumptions and judgments about the variables used in the calculation, including the fair value of our common stock, the expected term (the period of time that the options granted are expected to be outstanding), the volatility of our common stock, a risk-free interest rate, and expected dividends. We also estimate forfeitures of unvested stock options. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. No compensation cost is recorded for options that do not vest. We use the simplified calculation of expected life described in the SEC’s Staff Accounting Bulletin No. 107, Share-Based Payment, and volatility is based on an average of the historical volatilities of the common stock of four entities with characteristics similar to those of the Company. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. We use an expected dividend yield of zero, as we do not anticipate paying any dividends in the foreseeable future. Expected forfeitures are assumed to be zero due to the small number of plan participants and the plan. The weighted-average fair value calculations for options granted to employees under the employee stock plans and the inducement equity plan within the period are based on the following weighted average assumptions:
| For the quarter ended March 31 |
| 2015 |  |  | 2014 |
Dividend-yield |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  | 0.89 | % |  |  | 0.74 | %
Expected volatility |  | 78.79 | % |  |  | 78.73 | %
Expected life (years) |  | 3 |  |  |  | 3 |
Market value per share on grant date | $ | 3.88 |  |  | $ | 4.20 |
Weighted average fair value per share on grant date | $ | 1.99 |  |  | $ | 2.14 |
As of March 31, 2015, the Company had $790 thousand of total unrecognized compensation expense for employees which the Company will amortize over the 3.41 years of weighted remaining term. For non-employees under the stock plans and non-plan stock options, we account for stock-based compensation awards in accordance with ASC 505-50, Equity Based Payments to Non-Employees. Under ASC 505-50, we determine the fair value of the options using Black Scholes option pricing model on the grant date and we re-measure the fair value of these options to recognize expense for the portion of options which vest each quarter. We recognized the total expense on these non-employee options of $1 thousand and $2 thousand for the three months ended March 31, 2015 and 2014, respectively. As of March 31, 2015, the Company had $2 thousand of total unrecognized compensation expense for non-employees which the Company will amortize over the 3.41 years of weighted remaining term.

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References No definition available. + Details
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