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Securities Owned - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Securities Owned [Member]
Trading losses on securities owned	$ 2,762	$ 59

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- Definition

Unrealized profit and loss on trading securities held at the reporting date.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_FairValueByAssetClassAxis=wetf_SecuritiesOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: