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

X

- Definition

Deferred tax liability allocated to equity component related to convertible notes.

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Net issuance costs allocated to equity component related to convertible notes.

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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