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6. Stock-Based Compensation

6 Months Ended

Jun. 30, 2018

Stockholders' deficit:

6. Stock Based Compensation

Plan Stock Options

Aemetis authorized the issuance of 3.2 million shares of common stock under its Zymetis 2006 Stock Plan and Amended and Restated 2007 Stock Plan (together, the “Company Stock Plans”), which include both incentive and non-statutory stock options. These options generally expire five to ten 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.

On January18, 2018 and May 17, 2018, 725 and 423 thousand stock option grants were issued to employees and directors under the Company Stock Plans respectively. As of June 30, 2018, 2.9 million options are outstanding under the Company Stock Plans.

Inducement Equity Plan Options

In March 2016, the Board of Directors of the Company approved an Inducement Equity Plan authorizing the issuance of 100 thousand non-statutory stock options to purchase common stock. As of June 30, 2018, 12 thousand options were outstanding.

Common Stock Reserved for Issuance

The following is a summary of options granted under the Company Stock Plans:

		Shares Available for Grant				Number of Shares Outstanding				Weighted-Average Exercise Price

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			414				(414	)			4.38
Balance as of June 30, 2018			117				2,921			$	1.82

As of June 30, 2018, there were 1.7 million options vested under all the Company Stock Plans.

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 June 30, 2018 and 2017, the Company recorded stock compensation expense in the amount of $318 thousand and $195 thousand, respectively. For the six months ended June 30, 2018 and 2017, the Company recorded stock compensation expense in the amount of $581 thousand and $604 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 our estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. Compensation cost is recorded only for vested options. 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.

There were 423 thousand options granted during the three months ended June 30, 2018. The weighted average fair value calculations for options granted during the three months ended June 30, 2018 are based on the following assumptions:

Description		For the three months ended June 30, 2018
Dividend-yield			0	%
Risk-free interest rate			3.04	%
Expected volatility			85.6	%
Expected life (years)			6.48
Market value per share on grant date		$	1.71
Fair value per share on grant date		$	1.28

As of June 30, 2018, the Company had $1.2 million of total unrecognized compensation expense for employees, which the Company will amortize over the 2.0 years weighted average remaining term.