Quarterly report pursuant to Section 13 or 15(d)

Warrants - September 2019 Pre-funded and Series D Warrants (Details)

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Warrants - September 2019 Pre-funded and Series D Warrants (Details)
$ / shares in Units, $ in Millions
 1 Months Ended
Oct. 24, 2019
$ / shares
shares
Sep. 04, 2019
USD ($)
$ / shares
shares
Jan. 31, 2021
item
$ / shares
shares
Sep. 30, 2023
shares
Class of Warrant or Right [Line Items]        
Registered Direct Offering, common stock, aggregate shares offered, shares (in shares)   580,000    
Registered Direct Offering, common stock, aggregate shares offered, share price (in dollars per share) | $ / shares   $ 5.00    
Proceeds from Issuance of Common Stock and Warrants, Registered Direct Offering | $   $ 5.1    
Proceeds from Issuance of Common Stock and Warrants, Net of Offering Costs | $   $ 4.6    
September 2019 Pre-Funded Common Stock Warrants        
Class of Warrant or Right [Line Items]        
Aggregate shares called by warrants (in shares)   440,000    
Purchase price per warrant (in dollars per share) | $ / shares   $ 5.00    
Warrants exercised (in shares) 440,000      
Exercise price (in dollars per share) | $ / shares $ 0.001      
September 2019 Series D Common Stock Warrants        
Class of Warrant or Right [Line Items]        
Aggregate shares called by warrants (in shares)   765,000    
Warrants exercised (in shares)     690,000  
Exercise price (in dollars per share) | $ / shares   $ 6.12 $ 6.12  
Shares as percentage of Registered Direct Offering (as a percent)   75.00%    
Term   5 years    
Date from which warrants exercisable   Apr. 02, 2020    
Maturity date   Apr. 02, 2025    
Number of warrant holders | item     3  
Warrants exercised, shares issued (in shares)     352,279  
Outstanding warrants (in shares)       75,000