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INCOME TAXES - Schedule of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Valuation Allowance [Abstract] |  |  |
Balance at beginning of period | $ 101,020 | $ 90,247 | $ 99,585
Additions | 477 | 10,773 | 310
Deductions | (64,413) | 0 | (9,648)
Balance at end of period | $ 37,084 | $ 101,020 | $ 90,247

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- Definition Valuation allowance deferred tax asset additions. + 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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- 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

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