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Warrants (Tables)
6 Months Ended
Jun. 30, 2020
Warrants and Rights Note Disclosure [Abstract]  
Schedule of Outstanding Warrants to Purchase the Company's Common Stock
As of June 30, 2020 and December 31, 2019, the outstanding warrants to purchase the Company’s common stock were comprised of the following:
 
    
Equity Upon
Exercise
    
Exercise
 
Price
    
Expiration
 
Date
    
June 30,
2020
    
December 31,
2019
 
                         
(unaudited)
        
Warrants issued in 2015
     Common Stock      $ 5.25        1/30/25        7,616        7,616  
Warrants issued with 2018 Convertible Notes
     Common Stock      $ 0.10        6/7/28        501,946        501,946  
Warrants issued with 2018 Term Loan
     Series D convertible
preferred
 
 
   $ 16.67        7/31/28        26,998        26,998  
Warrants issued with 2019 Credit Agreement
     Series D convertible
preferred
 
 
   $ 16.67        5/20/29        419,992        419,992  
           
 
 
    
 
 
 
Total Warrants
              956,552        956,552