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 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//1943274/2147483119/928-440-50-1

+ 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

The amount of additional consideration payable to seller.

+ References

No definition available.

+ Details

Name:	xelb_AssetAcquisitionAdditionalConsiderationPayableToSeller
Namespace Prefix:	xelb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liability de-recognized from contingent consideration in asset acquisition.

+ References

No definition available.

+ Details

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

- Definition

Asset Acquisition, Contingent Obligation

+ References

No definition available.

+ Details

Name:	xelb_AssetAcquisitionContingentObligation
Namespace Prefix:	xelb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of earn out payments made by the Company.

+ References

No definition available.

+ Details

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

- Definition

Asset Acquisition, Royalties Term

+ References

No definition available.

+ Details

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

- Definition

Represents the maximum aggregate amount of contingent considerations.

+ References

No definition available.

+ Details

Name:	xelb_AssetAcquisitionsContingentConsiderationAmount
Namespace Prefix:	xelb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=xelb_IMTopcoLLCMember
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_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:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
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:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetAcquisitionAxis=xelb_LoriGoldsteinBrandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies - Narrative (Details) $ in Thousands				3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 12, 2024 USD ($)	May 31, 2022 USD ($) item	Apr. 01, 2021 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Commitments and Contingencies
Current portion of contingent obligation					$ 6,300
WHP \| IM Topco, LLC
Commitments and Contingencies
Current portion of contingent obligation					6,300
If Royalties Receivable Less Than Specified Amount
Commitments and Contingencies
Royalty guarantees					$ 13,500
Ownership equity transferable					12.50%
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 \| 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%
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
Disposed of by Sale \| WHP \| IM Topco, LLC
Commitments and Contingencies
Ownership interest		70.00%			70.00%
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
Lori Goldstein Brand
Commitments and Contingencies
Contingent consideration			$ 12,500
Royalties earned					6 years
Contingent obligation (Lori Goldstein Earn-Out)			$ 6,600	$ 300		$ 200
Additional consideration is payable to the seller						$ 1,000	$ 200
Waiver of earn out payments					$ 1,030
Derecognition of contingent obligations					$ 5,050