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Stock-based compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Number of
Options      
Beginning balance, outstanding (in shares) 3,560,144    
Granted (in shares) 0 0  
Exercised (in shares) 0    
Cancelled/Forfeited (in shares) (181,247)    
Ending balance, outstanding (in shares) 3,378,897   3,560,144
Options exercisable (in shares) 3,096,434    
Options vested and expected to vest (in shares) 3,378,897    
Weighted-Average
Exercise
Price      
Beginning balance, outstanding (in dollars per share) $ 7.09    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 0    
Cancelled/Forfeited (in dollars per share) 5.63    
Ending balance, outstanding (in dollars per share) 7.17   $ 7.09
Options exercisable (in dollars per share) 7.14    
Options vested and expected to vest (in dollars per share) $ 7.17    
Weighted Average Remaining Contractual Term      
Outstanding 4 years 8 months 12 days   4 years 10 months 24 days
Options exercisable 4 years 4 months 24 days    
Options vested and expected to vest 4 years 8 months 12 days    
Aggregate Intrinsic Value      
Outstanding $ 0   $ 0
Options exercisable 0    
Options vested and expected to vest $ 0