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INCOME TAXES - Schedule of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Balance at beginning of period | $ 37,084 | $ 101,020 | $ 90,247
Additions | 481 | 477 | 10,773
Deductions | (76) | (64,413) | 0
Balance at end of period | $ 37,489 | $ 37,084 | $ 101,020

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- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
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Balance Type: | na
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- Definition Valuation allowance deferred tax asset additions. + References No definition available. + Details
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Balance Type: | credit
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- Definition Valuation allowance deferred tax asset deductions. + References No definition available. + Details
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Namespace Prefix: | hlit_
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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
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