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Fair Value Measurements Summary of Investment Values Based Upon Fair Value Hierarchy (Detail)
Sep. 30, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents $ 115,294,424
Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents 115,294,424
Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents 0
Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents 0
Securities held in Consolidated Funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 28,035,352
Securities held in Consolidated Funds | Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 13,487,667
Securities held in Consolidated Funds | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 14,547,685
Securities held in Consolidated Funds | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 0
Company sponsored investments  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 25,997,804
Company sponsored investments | Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 25,997,804
Company sponsored investments | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: 0
Company sponsored investments | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value investments: $ 0