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Net Loss per Common Share - Anti-Dilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 6,285,554 2,037,313
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 499 1,643
Common Stock Warrants - Equity [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 3,991,373  
Common Stock Warrants - Liabilities [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares)   1,001,962
Common Stock Reserved For Conversion of Preferred Shares [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 2,147,394 1,001,962
Assumed Conversion of Convertible Notes [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 146,288 31,746