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Financial Instruments Owned (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financial Instruments Owned at Fair Value [Member] |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Net trading losses | $ 1,958 | $ 6,010 | $ 648 | $ 13,922

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