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AdvisorEngine - Financial Interests - Additional Information (Detail) - Advisor Engine [Member] $ in Thousands	Sep. 30, 2020 USD ($)
Maximum Amount of Contingent Payments That May be Received	$ 10,408
Upfront consideration paid to the Company	$ 9,592

X

- Definition

Maximum amount of contingent payments that may be received.

+ References

No definition available.

+ Details

Name:	wetf_MaximumAmountOfContingentPaymentsThatMayBeReceived
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Upfront consideration paid to the company.

+ References

No definition available.

+ Details

Name:	wetf_MaximumConsiderationPayableAtFutureDate
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wetf_AdvisorEngineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: