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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - Convertible Notes [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Net of Issuance Costs	$ 29	$ 157
Deferred tax liability	$ 222	$ 1,239

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- Definition

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

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- Definition

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

+ References

No definition available.

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Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: