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Significant Accounting Policies - Summary of Assets Under Management Subject to Fees (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Quarter Ending September 30, 2019  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees $ 31,391,099
Unearned variable rate fees 563,958
Quarter Ending March 31, 2020  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 11,224,113
Unearned variable rate fees 10,585
Quarter Ending September 30, 2021  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 247,707,871
Unearned variable rate fees 4,062,773
Total  
Principal Transaction Revenue [Line Items]  
AUM subject to variable rate fees 290,323,083
Unearned variable rate fees $ 4,637,316