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Significant Accounting Policies - Summary of Investment Values Based Upon Fair Value Hierarchy (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 72,669,083 $ 47,717,187
Fair Value, Measurements, Recurring | Level 1 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 72,669,083 47,717,187
Fair Value, Measurements, Recurring | Level 2 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Fair Value, Measurements, Recurring | Level 3 inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Securities held in Consolidated Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 65,890,500 57,355,471
Securities held in Consolidated Funds | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 65,890,500 57,355,471
Securities held in Consolidated Funds | Fair Value, Measurements, Recurring | Level 1 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 24,618,578 19,835,458
Securities held in Consolidated Funds | Fair Value, Measurements, Recurring | Level 2 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 41,271,922 37,520,013
Securities held in Consolidated Funds | Fair Value, Measurements, Recurring | Level 3 inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 0 0
Company sponsored investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 36,541,818 9,322,118
Company sponsored investments | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 36,541,818 9,322,118
Company sponsored investments | Fair Value, Measurements, Recurring | Level 1 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 36,541,818 9,322,118
Company sponsored investments | Fair Value, Measurements, Recurring | Level 2 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments 0 0
Company sponsored investments | Fair Value, Measurements, Recurring | Level 3 inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Investments $ 0 $ 0