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Significant accounting policies - Additional information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 08, 2022
Oct. 27, 2022
Sep. 30, 2022
shares
Aug. 04, 2022
$ / shares
shares
Aug. 03, 2022
shares
Jul. 27, 2022
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
May 18, 2020
$ / shares
Class of Stock [Line Items]                        
Reverse stock split ratio 0.02 0.02                    
Cumulative dividends percentage     8.00%       8.00%   8.00%   8.00%  
Number of common shares to issue on exercise of warrants     144,866       144,866   144,866      
State income tax payments made | $             $ 0 $ 0 $ 12,231 $ 2,000    
Percentage of cashless warrants exercised         20.00%              
Issuance of common stock and warrants, net of issuance costs (in shares)       931,667 36,196              
Warrants exercise price (in dollars per share) | $ / shares       $ 6.00                
Prefunded warrants                        
Class of Stock [Line Items]                        
Number of common shares to issue on exercise of warrants       401,667                
Percent of warrant becomes exercisable           20.00%            
Warrants exercise price (in dollars per share) | $ / shares       $ 0.005   $ 0.005            
Series A preferred stock (if converted)                        
Class of Stock [Line Items]                        
Per share of final price | $ / shares                       $ 902.70
Cumulative dividends percentage                       8.00%
Timber Sub | Redeemable Series A Convertible Preferred Stock                        
Class of Stock [Line Items]                        
Temporary Equity, Accretion to Redemption Value | $                     $ 2,100,000  
TardiMed                        
Class of Stock [Line Items]                        
Number of common shares to issue on exercise of warrants     181,083   36,196   181,083   181,083      
Number of common shares on conversion of units                 94,028      
TardiMed | Prefunded warrants                        
Class of Stock [Line Items]                        
Per share of final price | $ / shares           $ 11.95            
Number of common shares to issue on exercise of warrants         36,196 181,083            
Percent of warrant becomes exercisable     20.00%     20.00%            
Warrants exercise price (in dollars per share) | $ / shares           $ 0.0001            
TardiMed | Series A preferred stock (if converted)                        
Class of Stock [Line Items]                        
Number of common shares on conversion of units           1,819            
TardiMed | Redeemable Series A Convertible Preferred Stock                        
Class of Stock [Line Items]                        
Number of common shares on conversion of units           1,819