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10. Stock-Based Compensation (Tables)

12 Months Ended

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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