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Notes Receivables - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized		$ 2,498	$ 1,974
Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized	$ 0	$ 2,498
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_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Nonaccrual Loans Or Guarantees Date Of Nonaccrual Status.

+ References

No definition available.

+ Details

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

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- Definition

Paid-in-kind interest income.

+ References

No definition available.

+ Details

Name:	wetf_PaidInKindInterestIncome
Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_NotesReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: