XML 72 R106.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | $ 68,907 | $ 67,718 | $ 66,293 | $ 65,485 | $ 67,867 | $ 72,570 | $ 74,775 | $ 58,904 | $ 268,403 | $ 274,116 | $ 228,295
Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 265,652 | 271,104 | 226,692
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 2,751 | $ 3,012 | $ 1,603

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: |