v3.25.4

Income Taxes - Summary of Valuation Allowance on Deferred Tax Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Valuation allowance - beginning of the year | $ 637,609 | $ 536,311 | $ 408,794
Changes to existing valuation allowances - additions to costs and expenses | 50,249 | 99,229 | 105,181
Changes to existing valuation allowances - additions to other accounts (primarily goodwill) | 6,227 | 2,069 | 22,336
Valuation allowance - end of period | $ 694,085 | $ 637,609 | $ 536,311

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- Definition Valuation allowance, deferred tax asset, additions to costs and expenses. + References No definition available. + Details
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Namespace Prefix: | hubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation Allowance, Deferred Tax Asset, change in Amount primarily goodwill. + References No definition available. + Details
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Namespace Prefix: | hubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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