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INCOME TAXES - Schedule of Activities Related to Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Assets, Net of Valuation Allowance [Abstract]
Balance at beginning of period	$ 33,397	$ 32,869	$ 97,315
Additions	0	528	31
Deductions	(405)	0	(64,477)
Balance at end of period	$ 32,992	$ 33,397	$ 32,869

X

- Definition

Valuation allowance deferred tax asset addition.

+ References

No definition available.

+ Details

Name:	hlit_ValuationAllowanceDeferredTaxAssetAddition
Namespace Prefix:	hlit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Valuation allowance deferred tax asset deductions.

+ References

No definition available.

+ Details

Name:	hlit_ValuationAllowanceDeferredTaxAssetDeductions
Namespace Prefix:	hlit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant