Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Warrants (Details)

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Capital Structure - Warrants (Details) - $ / shares
Sep. 30, 2020
Dec. 31, 2018
Common Stock Warrants    
Number of shares available under warrant (in shares)   4,000,000
Exercise price per share (in dollars per share)   $ 12.50
Common Stock Warrants Expiration October 2020 | Common Stock    
Common Stock Warrants    
Number of shares available under warrant (in shares) 22,328  
Exercise price per share (in dollars per share) $ 8.40  
Common stock warrants, expiration date of May 2022 | Common Stock    
Common Stock Warrants    
Number of shares available under warrant (in shares) 2,380  
Exercise price per share (in dollars per share) $ 8.68  
Common Stock Warrants Expiration June 2024 | Common Stock    
Common Stock Warrants    
Number of shares available under warrant (in shares) 4,000,000  
Exercise price per share (in dollars per share) $ 12.50  
Warrants on common stock | Common Stock    
Common Stock Warrants    
Number of shares available under warrant (in shares) 4,024,708