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Marketable Securities and Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
Mar. 31, 2014
Dec. 31, 2013
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value $ 115,513,744 $ 56,140,255
Liabilities, fair value 6,045,903 19,540,583
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 96,092,252 36,517,147
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 18,011,492 18,905,608
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 1,410,000 717,500
Liabilities, fair value 6,045,903 19,540,583
Money market funds [Member]
    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 86,804,628 26,852,560
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 86,804,628 26,852,560
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 17,206,520 18,099,904
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 17,206,520 18,099,904
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
Municipal bonds [Member]
    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 804,972 805,704
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 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 804,972 805,704
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 0
Investment in affiliated entity [Member]
    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 9,287,624 9,664,587
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 9,287,624 9,664,587
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 1,410,000 717,500
Liabilities, fair value 6,045,903 19,540,583
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 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 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 1,410,000 717,500
Liabilities, fair value $ 6,045,903 $ 19,540,583