Quarterly report [Sections 13 or 15(d)]

Share-based compensation - Underwriters Warrants (Details)

v3.26.3
Share-based compensation - Underwriters Warrants (Details) - USD ($)
9 Months Ended 12 Months Ended
Mar. 18, 2023
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Sep. 30, 2022
Share-based compensation          
Warrants outstanding   4,386,037      
Number of warrants exercised   0 0    
Number of Shares          
Warrants granted   4,386,037      
Warrants outstanding at the end of the period   4,386,037      
Exercisable at the end of the period   4,386,037      
Weighted Average Exercise Price          
Weighted Average Exercise Price, Granted   $ 3.28      
Weighted Average Exercise Price, Outstanding at the ending of the period   3.28      
Weighted Average Exercise Price, Exercisable at the end of the period   $ 3.28      
Underwriter Warrants          
Share-based compensation          
Warrants outstanding   855   855  
Intrinsic value of underwriters warrants outstanding   $ 0      
Number of Shares          
Warrants outstanding at the beginning of the period   855      
Warrants outstanding at the end of the period   855   855  
Exercisable at the end of the period   855      
Weighted Average Exercise Price          
Weighted Average Exercise Price, Outstanding at the beginning of the period   $ 15.63      
Weighted Average Exercise Price, Outstanding at the ending of the period   15.63   $ 15.63  
Weighted Average Exercise Price, Exercisable at the end of the period   $ 15.63      
Weighted Average Remaining Contractual Term (in years)   11 months 19 days   1 year 8 months 19 days  
Exercisable contractual term (in years)   11 months 19 days      
Representative Warrants          
Share-based compensation          
Warrants to purchase shares         20,000
Warrants exercise price         $ 15.625
Remaining contractual term 5 years        
Percentage of warrants exercisable 100.00%        
Warrants outstanding   855      
Number of Shares          
Warrants outstanding at the end of the period   855      
Warrants          
Share-based compensation          
Unrecognized compensation expense   $ 0