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Fair Values of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

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 December 31, 2019                                
Corporate debt securities, available for sale   $ 7,985,886     $              ─     $ 7,985,886     $  
                                 
Recurring items as of December 31, 2018                                
Corporate debt securities, available for sale   $ 14,257,998     $     $ 14,257,998     $  
                                 
Liabilities:                                
                                 
Recurring items as of December 31, 2019                                
Earn-out milestone liability (Note 13)   $ 5,717,709     $     $     $ 5,717,709  
                                 
Recurring items as of December 31, 2018                                
Earn-out milestone liability (Note 13)   $ 8,907,664     $          ─     $     $ 8,907,664