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Marketable Securities and Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
Sep. 30, 2013
Dec. 31, 2012
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value $ 42,772,783 $ 20,690,939
Liabilities, fair value 14,095,818 2,859,899
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 29,423,020 12,389,738
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 13,104,863 8,034,001
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 244,900 267,200
Liabilities, fair value 14,095,818 2,859,899
Money market funds [Member]
    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value 18,338,897 1,686,406
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 18,338,897 1,686,406
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 13,104,863 7,583,931
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 13,104,863 7,583,931
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
Certificates of deposit [Member]
    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   250,000
Certificates of deposit [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
Certificates of deposit [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   250,000
Certificates of deposit [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
Municipal bonds [Member]
    
Financial assets and liabilities that are measured at fair value on recurring basis    
Assets, fair value   200,070
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   200,070
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 11,084,123 10,703,332
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 11,084,123 10,703,332
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 244,900 267,200
Liabilities, fair value 14,095,818 2,859,899
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 244,900 267,200
Liabilities, fair value $ 14,095,818 $ 2,859,899