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10. Stock-Based Compensation (Details 1) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Options
Number of outstanding, ending		2,889	2,189
Weighted average exercise price outstanding, ending		$ 1.80	$ 2.70
Remaining contractual term (in years)		7 years 9 months 18 days	6 years 8 months 5 days
Average intrinsic value	[1]	$ 0	$ 0
Vested Options
Number of outstanding, ending		1,923	1,515
Weighted average exercise price outstanding, ending		$ 2.01	$ 2.94
Remaining contractual term (in years)		7 years 4 months 2 days	5 years 9 months 29 days
Average intrinsic value	[1]	$ 0	$ 0
Unvested Options
Number of outstanding, ending		966	674
Weighted average exercise price outstanding, ending		$ 1.38	$ 2.16
Remaining contractual term (in years)		8 years 9 months 22 days	8 years 7 months 13 days
Average intrinsic value	[1]	$ 0	$ 0
[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.

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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