Securities Owned - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Securities Owned [Member]
Trading losses on securities owned	$ 6,010	$ 1,323	$ 13,922	$ 2,156

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

No definition available.

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