Significant Accounting Policies - Textual (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Organization And Significant Accounting Policies [Line Items]
Number of business segment | Segment	1
Allowance for doubtful accounts	$ 0	$ 0
Accounts receivable, related parties	10,700,000	9,400,000
Accumulated depreciation	$ 6,400,000	5,200,000
Client performance period	5 years
Revenue	$ 136,624,380	145,627,748	$ 145,201,729
Advance commissions amortization period	12 months
UMA Program [Member]
Business Organization And Significant Accounting Policies [Line Items]
Revenue	$ 2,000,000.0	1,500,000	1,200,000
Variable rate fees
Business Organization And Significant Accounting Policies [Line Items]
Revenue	1,300,000	1,400,000	200,000
Mutual fund administration revenue, net
Business Organization And Significant Accounting Policies [Line Items]
Revenue	$ 8,614,971	$ 10,309,943	$ 12,513,267