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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value $ 179,825,048 $ 102,440,851
Liabilities, fair value 1,301,138 2,022,729
Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 74,461,801 48,814,877
Liabilities, fair value 0 0
Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 105,357,277 53,075,974
Liabilities, fair value 0 0
Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 5,970 550,000
Liabilities, fair value 1,301,138 2,022,729
Money market funds    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 54,474,609 36,474,066
Money market funds | Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 54,474,609 $ 36,474,066
Money market funds | Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0
Money market funds | Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 $ 0
Mutual funds    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 78,385,992 29,273,635
Mutual funds | Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Mutual funds | Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 78,385,992 29,273,635
Mutual funds | Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
US corporate debt securities    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 26,869,403 23,802,339
US corporate debt securities | Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
US corporate debt securities | Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 26,869,403 23,802,339
US corporate debt securities | Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Municipal bonds    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 101,882  
Municipal bonds | Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0  
Municipal bonds | Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 101,882  
Municipal bonds | Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0  
Investments in affiliated entities    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 19,987,192 12,340,811
Investments in affiliated entities | Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 19,987,192 12,340,811
Investments in affiliated entities | Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Investments in affiliated entities | Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Common stock warrants    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 5,970 550,000
Liabilities, fair value 1,301,138 2,022,729
Common stock warrants | Quoted Prices in Active Markets (Level 1)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Liabilities, fair value 0 0
Common stock warrants | Significant Other Unobservable Inputs (Level 2)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Liabilities, fair value 0 0
Common stock warrants | Significant Unobservable Inputs (Level 3)    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 5,970 550,000
Liabilities, fair value $ 1,301,138 $ 2,022,729