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Fair value measurements - Recurring basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Nov. 30, 2022
Oct. 31, 2022
Fair value of financial instruments        
Common stock for no additional consideration $ 1,000      
November 2022 Series B        
Fair value of financial instruments        
Exercised warrants 8      
Common stock for no additional consideration $ 0      
Warrants exercise price $ 0   $ 0 $ 3
Recurring        
Fair value of financial instruments        
Warrant liabilities $ 361,000 $ 658,000    
Total 361,000 658,000    
Recurring | Level 2        
Fair value of financial instruments        
Warrant liabilities 361,000 658,000    
Total $ 361,000 $ 658,000