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Stock-based compensation - Stock options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Number of Shares      
Balance at the beginning 4,462,517    
Options granted 1,276,597    
Options exercised (44,792)    
Options forfeited/expired (147)    
Balance at the end 5,694,175   4,462,517
Vested and expected to vest 5,694,175    
Exercisable at the end 3,422,341    
Weighted-Average Exercise Price      
Balance at the beginning (in dollars per share) $ 6.58    
Options granted (in dollars per share) 4.83    
Options exercised (in dollars per share) 6.14    
Options forfeited/expired (in dollars per share) 23.05    
Balance at the end (in dollars per share) 6.19   $ 6.58
Vested and expected to vest (in dollars per share) 6.19    
Exercisable at the end (in dollars per share) $ 6.74    
Term and Intrinsic Value      
Weighted- Average Remaining Contractual Term, Outstanding 7 years 3 months 18 days   7 years 4 months 24 days
Weighted Average Remaining Contractual Term - Vested and expected to vest 7 years 3 months 18 days    
Weighted- Average Remaining Contractual Term, Exercisable 6 years 3 months 18 days    
Aggregate Intrinsic Value, Outstanding $ 7,048   $ 619
Aggregate Intrinsic Value - Vested and expected to vest 7,048    
Aggregate Intrinsic Value - Exercisable $ 2,668    
Weighted average grant date fair value $ 3.77 $ 3.42  
Intrinsic value options exercised $ 200 $ 100  
Proceeds from exercise of stock options $ 275 $ 114  
Time-based options      
Term and Intrinsic Value      
Vesting period 4 years    
Total unrecognized compensation cost $ 9,400    
Unrecognized compensation cost remaining period 2 years 2 months 12 days    
Performance-based options      
Number of Shares      
Balance at the end 477,467    
Weighted-Average Exercise Price      
Balance at the end (in dollars per share) $ 6.44