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Significant Accounting Policies - Assets under Management (AUM) Subject to Incentive Fees and Incentive Fees (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
Quarter Ending December 31, 2019  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees $ 62,831,955
Unearned variable rate fees 612,273
Quarter Ending March 31, 2020  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 13,476,137
Unearned variable rate fees 0
Quarter Ending September 30, 2020  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 37,469,889
Unearned variable rate fees 179,474
Quarter Ending September 30, 2021  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 284,414,344
Unearned variable rate fees 6,328,189
Total  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 398,192,325
Unearned variable rate fees $ 7,119,936