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Securities Owned- Schedule of Securities Owned (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities Owned [Line Items]
Securities Owned Total	$ 119,390	$ 34,895
Trading Securities [Member]
Securities Owned [Line Items]
Securities Owned Total	$ 119,390	$ 34,895

X

- Definition

Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

+ Details

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

X

- Definition

Securities Owned.

+ References

No definition available.

+ Details

Name:	wetf_SecuritiesOwnedLineItems
Namespace Prefix:	wetf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_InformationByCategoryOfDebtSecurityAxis=wetf_TradingSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: