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Outstanding Warrants (Tables) | 12 Months Ended
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Dec. 31, 2021
Outstanding Warrants |
Weighted average assumptions |
Description |  | For the year ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Dividend-yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 0.21 | % |  |  | 0.84 | % |  |  | 2.13 | %
Expected volatility |  |  | 136.16 | % |  |  | 108.8 | % |  |  | 103.0 | %
Expected life (years) |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Exercise price per share |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 0.01 |
Market value per share on grant date |  | $ | 9.92 |  |  | $ | 0.81 |  |  | $ | 0.73 |
Fair value per share on grant date |  | $ | 9.91 |  |  | $ | 0.80 |  |  | $ | 0.72 |
Schedule of warrant activity |
|  | Warrants Outstanding & Exercisable |  |  | Weighted - Average Exercise Price |  |  | Average Remaining Term in Years |
Outstanding December 31, 2018 |  |  | 95 |  |  | $ | 2.59 |  |  |  | 6.95 |
Granted |  |  | 227 |  |  |  | 0.01 |  |  |  |  |
Exercised |  |  | (227 | ) |  |  | 0.01 |  |  |  |  |
Outstanding December 31, 2019 |  |  | 95 |  |  | $ | 2.59 |  |  |  | 5.95 |
Granted |  |  | 227 |  |  |  | 0.01 |  |  |  |  |
Exercised |  |  | (227 | ) |  |  | 0.01 |  |  |  |  |
Outstanding December 31, 2020 |  |  | 95 |  |  | $ | 2.59 |  |  |  | 4.95 |
Granted |  |  | 292 |  |  |  | 0.01 |  |  |  |  |
Exercised |  |  | (332 | ) |  |  | 0.32 |  |  |  |  |
Outstanding December 31, 2021 |  |  | 55 |  |  | $ | 2.59 |  |  |  | 3.95 |

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- Definition Custom Element. + References No definition available. + Details
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Namespace Prefix: | amtx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration