Quarterly report [Sections 13 or 15(d)]

Share-based compensation - Underwriters Warrants (Details)

v3.25.3
Share-based compensation - Underwriters Warrants (Details) - USD ($)
9 Months Ended 12 Months Ended
Mar. 18, 2023
Dec. 21, 2021
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Sep. 30, 2022
Share-based compensation            
Warrants to purchase shares   6,900       20,000
Warrants exercise price   $ 312.5       $ 15.625
Percentage of warrants exercisable 100.00% 100.00%        
Number of Shares            
Warrants outstanding at the beginning of the period     7,755      
Warrants outstanding at the end of the period     7,755   7,755  
Exercisable at end of the period     7,755      
Weighted Average Exercise Price            
Outstanding at the beginning of the period     $ 279.77      
Outstanding at the end of the period     279.77   $ 279.77  
Exercisable at end of the period     $ 279.77      
Weighted Average Remaining Contractual Term     4 months 24 days   1 year 1 month 24 days  
Exercisable contractual term     4 months 24 days      
Intrinsic value of warrants outstanding     $ 0      
Warrants            
Share-based compensation            
Representative warrants exercised     0 0    
Unrecognized compensation expense     $ 0      
Representative Warrants            
Number of Shares            
Warrants outstanding at the end of the period     855