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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Assets and Liabilities

Assets and liabilities measured at fair value are summarized below:

 

    Total Fair Value    

Quoted Prices

In Active Markets

For Identical Assets/Liabilities (Level 1)

    

Significant Other Observable Inputs

(Level 2)

    

Significant Unobservable Inputs

(Level 3)

  
Assets:                                
                                 
Recurring items as of September 30, 2018                                
Investment securities, available for sale   $ 18,579,731     $ 18,579,731     $ ─     $ ─  
                                 
Recurring items as of December 31, 2017                                
Investment securities, available for sale   $ 12,724,020     $ 12,724,020     $ ─     $ ─  
                                 
Liabilities:                                
                                 
Recurring items as of September 30, 2018                                
Earn-out milestone liability (Note 13)   $ 8,970,854     $ ─     $ ─     $ 8,970,854  
                                 
Recurring items as of December 31, 2017                                
Earn-out milestone liability (Note 13)   $ 12,538,525     $ ─     $ ─     $ 12,538,525