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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
Name: | alar_AtthemarketOfferingNetOfIssuanceCosts
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