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Marketable Securities and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value $ 135,510,403 $ 179,825,048
Liabilities, fair value 1,812,502 1,301,138
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 39,074,818 74,461,801
Liabilities, fair value 0 0
Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 96,435,585 105,357,277
Liabilities, fair value 0 0
Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 5,970
Liabilities, fair value 1,812,502 1,301,138
Money market funds [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 13,778,470 54,474,609
Money market funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 13,778,470 54,474,609
Money market funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Money market funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Mutual funds [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 70,235,667 78,385,992
Mutual funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Mutual funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 70,235,667 78,385,992
Mutual funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
US corporate debt securities [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 26,199,918 26,869,403
US corporate debt securities [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
US corporate debt securities [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 26,199,918 26,869,403
US corporate debt securities [Member] | Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Municipal Bonds [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   101,882
Municipal Bonds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   0
Municipal Bonds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   101,882
Municipal Bonds [Member] | Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   0
Investment in affiliated entity [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 25,296,348 19,987,192
Investment in affiliated entity [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 25,296,348 19,987,192
Investment in affiliated entity [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Investment in affiliated entity [Member] | Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 0 0
Common stock warrants [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   5,970
Liabilities, fair value 1,812,502 1,301,138
Common stock warrants [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   0
Liabilities, fair value 0 0
Common stock warrants [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   0
Liabilities, fair value 0 0
Common stock warrants [Member] | Using Significant Unobservable Inputs (Level 3) [Member]    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   5,970
Liabilities, fair value $ 1,812,502 $ 1,301,138