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Notes Receivables - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income recognized |  |  |  | $ 1,856
Notes Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest income recognized | $ 0 | $ 633 | $ 0 | $ 1,856
Notes Receivable on Nonaccrual Status |  |  | Effective January 1, 2020, notes receivable were placed on non-accrual status. |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Nonaccrual Loans Or Guarantees Date Of Nonaccrual Status. + References No definition available. + Details
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- Definition Paid-in-kind interest income. + References No definition available. + Details
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Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |