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INCOME TAXES - Schedule of Activities Related to Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_DeferredTaxAssetsNetOfValuationAllowanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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