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Consolidated Statements of Changes in Equity (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2021
Consolidated Statements Of Changes In Equity [Abstract]
Direct registered offerings, net of issuance costs		$ 527
At-the-market offering, net of issuance costs	$ 164
Private placement, net of issuance costs	$ 499

X

- Definition

The amount of at-the-market offering, net of issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	alar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	alar_ConsolidatedStatementsOfChangesInEquityAbstract
Namespace Prefix:	alar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of direct registered offerings, net of issuance costs.

+ References

No definition available.

+ Details

Name:	alar_DirectRegisteredOfferingsNetOfIssuanceCosts
Namespace Prefix:	alar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of private placement, net of issuance costs.

+ References

No definition available.

+ Details

Name:	alar_PrivatePlacementNetOfIssuanceCosts
Namespace Prefix:	alar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration