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10. Stock Based Compensation | 3 Months Ended
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Mar. 31, 2014
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 the 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 and are exercisable at any time after the date of the grant, subject to vesting. The following is a summary of options granted under the employee stock plans:
|  | Shares Available for Grant |  |  | Number of Shares Oustanding |  |  | Weighted-Average Balance Price |
Balance of December 31, 2013 |  |  | 74 |  |  |  | 913 |  |  | $ | 4.90 |
Authorized |  |  | 100 |  |  |  | - |  |  |  | - |
Granted |  |  | (148 | ) |  |  | 148 |  |  | $ | 4.20 |
Exercised |  |  | - |  |  |  | (15 | ) |  |  | 1.60 |
Forfeited/expired |  |  | 2 |  |  |  | (2 | ) |  |  | 5.50 |
Balance of March 31, 2014 |  |  | 28 |  |  |  | 1,044 |  |  | $ | 4.89 |
For the three months ended March 31, 2014 and 2013 the Company recorded option expenses in the amount of $0.1 million for each period. Included in the three months ended March 31, 2014 and 2013 option expenses were $3 thousand and $7 thousand, respectively, of outstanding consultant options subject to periodic fair value re-measurement under ASC 505-50-30 Equity Based Payments to Non Employees. The valuation using the Black-Scholes valuation pricing model is based upon the current market value of the Company’s common stock and other current assumptions, including the expected term (contractual term for consultant options). The Company records the expense related to consultant options using the accelerated expense pattern prescribed in ASC 505-50-30. Valuation and Expense Information. The weighted-average fair value calculations for consultant and employee options are based on the following weighted average assumptions:
|  | As of March 31, |
|  | 2014 |  |  | 2013 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 0. 44 - 0.74 | % |  |  | 0.23 - 0.57 | %
Expected volatility |  |  | 70.16 - 79.93 | % |  |  | 58.88 - 81.24 | %
Expected life (years) |  |  | 0.8 - 3.0 |  |  |  | 0.5 - 4.0 |
Market price of the common stock |  | $ | 4.20 - 5.80 |  |  | $ | 6.10 |
As of March 31, 2014, the Company had $1.3 million and $10 thousand of total unrecognized compensation expense for employees and non-employees that the Company will amortize over the 4.2 weighted remaining term of the option agreements. Non-Plan Stock Options In November 2013 the Company issued 98 thousand stock options to board members and consultants outside of the Company Stock Option Plans. As of March 31, 2014, 76 thousand options vested and 22 thousand unvested at remaining contractual term of 3.6 years. All of the non-plan options remain outstanding.

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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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