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9. Stock-Based Compensation (Details 1) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Options
Number of Outstanding, Ending		2,189	1,632
Weighted Average Exercise Price Outstanding, Ending		$ 2.70	$ 4.37
Remaining Contractual Term (In Years)		6 years 8 months 5 days	5 years 5 months 8 days
Average Intrinsic Value	[1]	$ 0	$ 0
Vested Options
Number of Outstanding, Ending		1,515	977
Weighted Average Exercise Price Outstanding, Ending		$ 2.94	$ 5.45
Remaining Contractual Term (In Years)		5 years 9 months 29 days	3 years 3 months 11 days
Average Intrinsic Value	[1]	$ 0	$ 0
Unvested Options
Number of Outstanding, Ending		674	655
Weighted Average Exercise Price Outstanding, Ending		$ 2.16	$ 2.76
Remaining Contractual Term (In Years)		8 years 7 months 13 days	8 years 7 months 28 days
Average Intrinsic Value	[1]	$ 0	$ 0
[1] Intrinsic value based on the $0.55 and $1.39 closing price of Aemetis stock on December 31, 2017 and 2016 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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