XML 107 R91.htm IDEA: XBRL DOCUMENT v3.21.2

Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	$ 78,112	$ 63,749	$ 225,143	$ 184,260
Advisory Fees [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	76,400	63,028	220,611	181,697
Other Income [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	$ 1,712	$ 721	$ 4,532	$ 2,563

X

- Definition

Revenues from operations, excluding interest and dividend income. Includes revenues from the following sources: investment banking (underwriting and financial advisory), principal transactions (sales and trading, and investment gains and losses), commissions, asset management, and investment advisory and other services.

+ References

No definition available.

+ Details

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

X

- Definition

Revenues Categorized As Revenues From Contracts With Customers And Other Sources Of Revenues [Line Items]

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_InvestmentAdvisoryManagementAndAdministrativeServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=wetf_OtherServicesIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: