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v3.20.4

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - Convertible Notes [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Net of Issuance Costs | $ 157
Deferred tax liability | $ 1,239

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- Definition Deferred tax liability allocated to equity component related to convertible notes. + References No definition available. + Details
Name: | wetf_DeferredTaxLiability
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net issuance costs allocated to equity component related to convertible notes. + References No definition available. + Details
Name: | wetf_NetOfIssuanceCosts
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |