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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.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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