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Summary of Significant Accounting Policies - Schedule of Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2022
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	Lesser of the estimated life or remaining lease term
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	4 years
Computer Hardware and Software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Construction In progress
Property, Plant and Equipment [Line Items]
Estimated Useful Life	Not depreciated

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126905813&loc=d3e1205-110223

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=amlx_ComputerHardwareAndSoftwareMember
Namespace Prefix:
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Balance Type:
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X

- Details

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