Income Taxes - Change in valuation allowance (Details) $ in Thousands	12 Months Ended
Dec. 31, 2025 USD ($)
Change in valuation allowance [Roll Forward]
Beginning balance	$ 132,605
Change charged to income tax expense	(14,333)
Changes charged to additional paid-in-capital	(1,091)
Ending balance	$ 148,029

Deferred Tax Asset, Valuation Allowance, Charges Charged to Additional Paid-in-Capital

No definition available.

Name:	fnko_DeferredTaxAssetValuationAllowanceChargesChargedToAdditionalPaidInCapital
Namespace Prefix:	fnko_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Valuation Allowance, Deferred Tax Asset, Charge to Income Tax Expense

+ References

No definition available.

+ Details

Name:	fnko_ValuationAllowanceDeferredTaxAssetChargeToIncomeTaxExpense
Namespace Prefix:	fnko_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration