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Securities Owned - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Trading losses on securities owned	$ 1,323	$ 180	$ 2,156	$ 25

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- Definition

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

+ References

No definition available.

+ Details

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