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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Estimated Useful Lives at Annual Rates) (Details) | 12 Months Ended
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Dec. 31, 2025
Lab equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives, annual rate | 16.00% |
Lab equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives, annual rate | 25.00% |
Computers and peripheral equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives, annual rate | 33.00% |
Office furniture [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives, annual rate | 6.00% |
SECaaS equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives, annual rate | 25.00% | [1]
Leasehold improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful lives | us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember |
[1] | SECaaS equipment – the equipment used for SECaaS revenues

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- Definition Represents the rate at which the assets is depreciated anually. + References No definition available. + Details
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Namespace Prefix: | allt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates description of term of useful life for property, plant, and equipment when not stated as numeric value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482190/360-10-35-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=allt_SecurityAsServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |