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Investments - Summary of Cost and Fair Value of Investments in Proprietary Funds (Details) - Proprietary Funds - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Cost $ 723 $ 769
Gross Unrealized Gains 44 169
Gross Unrealized (Losses) (96) (26)
Fair Value $ 671 $ 912