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Significant Accounting Policies - Assets under Management (AUM) Subject to Incentive Fees and Incentive Fees (Detail)
9 Months Ended
Sep. 30, 2017
USD ($)
Quarter Ended December 31, 2018  
Principal Transaction Revenue [Line Items]  
AUM subject to variable fees $ 107,864,155
Unearned variable fees 1,379,545
Quarter Ended September 30, 2019  
Principal Transaction Revenue [Line Items]  
AUM subject to variable fees 34,040,712
Unearned variable fees 495,418
Quarter Ended March 31, 2020  
Principal Transaction Revenue [Line Items]  
AUM subject to variable fees 11,680,413
Unearned variable fees 0
Quarter Ended September 30, 2021  
Principal Transaction Revenue [Line Items]  
AUM subject to variable fees 264,626,823
Unearned variable fees 1,971,752
Total  
Principal Transaction Revenue [Line Items]  
AUM subject to variable fees 418,212,103
Unearned variable fees $ 3,846,715