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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Estimated Useful Lives at Annual Rates) (Details)	12 Months Ended
	Dec. 31, 2020
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 and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, annual rate	6.00%
Equipment at customer site [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, annual rate	16.00%
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	Over the shorter of the term of the lease or the useful life of the asset

X

- Definition

Represents the rate at which the assets is depreciated anually.

+ References

No definition available.

+ Details

Name:	allt_PropertyPlantAndEquipmentEstimatedUsefulLivesAnnualRate
Namespace Prefix:	allt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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 http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
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

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OtherMachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=allt_EquipmentAtCustomerSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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