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Leases - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Sep. 09, 2021	Sep. 30, 2021	Sep. 30, 2021
Operating lease, impairment loss		$ 9,277
Payment of lease termination fee	$ 12,725		$ 12,725

X

- Definition

Amount of gain (loss) on termination of lease before expiration of lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 40
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123386189&loc=SL77918607-209975

+ Details

Name:	us-gaap_GainLossOnTerminationOfLease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Payment of Lease Termination Fee.

+ References

No definition available.

+ Details

Name:	wetf_PaymentOfLeaseTerminationFee
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration