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Business Combination and Acquisitions - Summary of reconciles elements of business combination to cash flows (Parenthetical) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |
Empowers trust and cash redemptions | $ 99,353
Transaction costs | $ 44,314

X
- Definition Payments for redemption of common stock. + References No definition available. + Details
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Namespace Prefix: | hlly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration