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Contingencies - Additional Information (Detail) - Dec. 31, 2022 € in Thousands, $ in Thousands	EUR (€)	USD ($)
Court Of Turin And Court Of Milan [Member]
Loss contingency acrual	€ 15,800	$ 16,870

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349

+ Details

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

X

- Details

Name:	wetf_PlaceOfAppearanceOfLitigationAxis=wetf_CourtofturinandcourtofmilanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: