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Fair Value Measurements - Textual (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 80,690,647 $ 72,669,083
Securities held in Consolidated Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value investments 153,730,480 65,890,500
Parent | Securities held in Consolidated Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value investments 84,700,000 42,600,000
Redeemable Noncontrolling Interest | Securities held in Consolidated Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value investments 69,000,000 23,300,000
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 80,690,647 72,669,083
Level 1 | Securities held in Consolidated Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value investments 43,595,438 24,618,578
Level 1 | Money Market Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 80,700,000 $ 72,700,000