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Acquisitions and Exit Activities - Schedule of Operating Losses (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
WisdomTree Japan Inc. ("WTJ") [Member]
Lease Impairment Charges	$ 572

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- Definition

Lease Impairment charges.

+ References

No definition available.

+ Details

Name:	wetf_LeaseImpairmentCharges
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=wetf_WisdomtreeJapanIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: