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Common Stock and Preferred Stock (Converted into Common Stock) - Registered Direct Offering (Details) - April 2020 Equity Issuances - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Apr. 27, 2020
Apr. 23, 2020
Sep. 30, 2020
Sep. 30, 2019
Class of Stock [Line Items]        
Cash fee, percent of gross proceeds   6.50%    
Shares issued in private placement transaction (in shares)   1,764,706    
Sale of stock, price per share (in dollars per share)   $ 8.50    
Proceeds from issuance of common stock $ 13,900 $ 15,000 $ 13,918 $ 0