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Liabilities under Tax Receivable Agreement - Schedule of Liability Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Liabilities Under Tax Receivable Agreement [Roll Forward] |  |  |
Beginning Balance | $ 547 | $ 8,960 | $ 109,187
Additional liabilities for exchanges | 3,284 | 0 | 0
Adjustment to remeasurement of liabilities | (3,711) | 547 | (100,223)
Ending balance | $ 120 | $ 547 | $ 8,960

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- Definition The amount of liability recognized at the balance sheet date under the tax receivable agreement with owners includes amount owed to the owners plus accrued interest. + References No definition available. + Details
Name: | fnko_LiabilitiesUnderTaxReceivableAgreement
Namespace Prefix: | fnko_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liabilities Under Tax Receivable Agreement, Additions + References No definition available. + Details
Name: | fnko_LiabilitiesUnderTaxReceivableAgreementAdditions
Namespace Prefix: | fnko_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Liabilities Under Tax Receivable Agreement + References No definition available. + Details
Name: | fnko_LiabilitiesUnderTaxReceivableAgreementRollForward
Namespace Prefix: | fnko_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other Nonoperating Income (Expense) Related To Premeasurement Adjustments + References No definition available. + Details
Name: | fnko_OtherNonoperatingIncomeExpenseRelatedToPremeasurementAdjustments
Namespace Prefix: | fnko_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration