Amount of liability recognized from contingent consideration in asset acquisition, classified as current.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 15
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480123/805-50-15-3

+ Details

Name:	us-gaap_AssetAcquisitionContingentConsiderationLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount the entity has committed to make for future royalty guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 928
-SubTopic 440
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477866/928-440-50-1

+ Details

Name:	us-gaap_RoyaltyGuaranteesCommitmentsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount payable as adjustment to purchase price previously received by the company.

+ References

No definition available.

+ Details

Name:	xelb_AdjustmentToPurchasePricePayable
Namespace Prefix:	xelb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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:	xelb_CommitmentsAndContingenciesLineItems
Namespace Prefix:	xelb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent obligations, expected to be settled within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	xelb_CurrentPortionOfContingentObligations
Namespace Prefix:	xelb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of adjustments of expense (income) to carrying value of contingent contractual obligations.

+ References

No definition available.

+ Details

Name:	xelb_InvestmentsExpenseIncomeAdjustmentsToCarryingValueOfContingentContractualObligations
Namespace Prefix:	xelb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of consecutive quarters for royalty payable term.

+ References

No definition available.

+ Details

Name:	xelb_NumberOfConsecutiveQuartersForRoyaltyPayableTerm
Namespace Prefix:	xelb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting transferable should certain conditions be met.

+ References

No definition available.

+ Details

Name:	xelb_OwnershipInterestTransferable
Namespace Prefix:	xelb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of time that royalties will be payable.

+ References

No definition available.

+ Details

Name:	xelb_RoyaltyPayableTerm
Namespace Prefix:	xelb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=xelb_IMTopcoLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=xelb_ImWhpLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=xelb_AmendedServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=xelb_XcelBrandsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=xelb_TwelveMonthPeriodEndingMarch312025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=xelb_YearEndingDecember312025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=xelb_IfRoyaltiesReceivableLessThanSpecifiedAmountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherCommitmentsAxis=xelb_IsaacMizrahiSaleTransactionWithImTopcoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies - Narrative (Details) $ in Thousands				3 Months Ended	6 Months Ended
	Mar. 31, 2025 USD ($)	Apr. 12, 2024 USD ($)	May 31, 2022 USD ($) item	Mar. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Apr. 15, 2025	Dec. 31, 2024 USD ($)
Commitments and Contingencies
Contingent obligations							$ 4,213
IM Topco, LLC
Commitments and Contingencies
Ownership interest			30.00%			30.00%
Contingent obligations	$ 3,970			$ 3,970
Expense (income) to carrying value of contingent contractual obligations				$ (240)	$ (240)
WHP \| IM Topco, LLC
Commitments and Contingencies
Ownership equity transferable	12.50%
Current portion of contingent obligation							$ 4,210
Amended Services Agreement \| Xcel Brands \| IM Topco, LLC
Commitments and Contingencies
Ownership interest		30.00%
Amended Services Agreement \| WHP \| IM Topco, LLC
Commitments and Contingencies
Ownership interest		70.00%
Amended Services Agreement \| Twelve-month period ending March 31, 2025
Commitments and Contingencies
Royalty guarantees		$ 13,500
Amended Services Agreement \| Year ending December 31, 2025
Commitments and Contingencies
Royalty guarantees		$ 18,000
Amended Services Agreement \| If Royalties Receivable Less Than Specified Amount
Commitments and Contingencies
Ownership equity transferable		12.50%
Amended Services Agreement \| If Royalties Receivable Less Than Specified Amount \| Xcel Brands \| IM Topco, LLC
Commitments and Contingencies
Ownership interest		17.50%
Amended Services Agreement \| If Royalties Receivable Less Than Specified Amount \| WHP \| IM Topco, LLC
Commitments and Contingencies
Ownership interest		82.50%
Isaac Mizrahi sale transaction with IM Topco \| Disposed of by Sale
Commitments and Contingencies
Number of consecutive quarters for royalty payable term \| item			4
Royalty payable term			3 years
Isaac Mizrahi sale transaction with IM Topco \| Disposed of by Sale \| Maximum
Commitments and Contingencies
Royalty guarantees			$ 13,300
Adjustments to purchase price payable			$ 16,000