Short-Term Investments - Additional Information (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Available-for-sale investments contractual maturity period	1 year	1 year

Available-for-sale investments contractual maturity period.

No definition available.

Name:	amlx_AvailableForSaleInvestmentsContractualMaturityPeriod
Namespace Prefix:	amlx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration