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9. Stock-Based Compensation (Details 1) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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.

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- 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 + Details
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- Definition 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 Reference 2: 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)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 + Details
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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 + Details
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