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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |  |  |
Net losses related to certain WisdomTree ETFs | $ 489 | $ 92 | $ 1,608 | $ 75 |
WisdomTree ETF [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment | $ 12,387 |  | $ 12,387 |  | $ 18,526

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