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Fair Value Measurements (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value Disclosures [Abstract] |  |
Property and equipment held-for-sale | $ 0 | $ 1,000,000
Pre-funded warrants | $ 0.001 |
Other Warrants | $ 9.757 |

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- Definition Other Warrants. + References No definition available. + Details
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Namespace Prefix: | alto_
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Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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