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Stock-based compensation - Schedule of Return Target and Service Based Options Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Target-Based Stock Options    
Options    
Outstanding, beginning of period (in shares) | shares 2,265,275  
Exercised (in shares) | shares (118,234)  
Outstanding, end of period (in shares) | shares 2,147,041 2,265,275
Options exercisable (in shares) | shares 2,147,041  
Vested or expected to vest (in shares) | shares 2,147,041  
Weighted-Average Exercise Price    
Outstanding, beginning of period (in dollars per share) | $ / shares $ 6.66  
Exercised (in dollars per share) | $ / shares 7.33  
Outstanding, end of period (in dollars per share) | $ / shares 6.62 $ 6.66
Options exercisable (in dollars per share) | $ / shares 6.62  
Vested or expected to vest (in dollars per share) | $ / shares $ 6.62  
Weighted-Average Remaining Contractual Term (Years)    
Remaining term, options outstanding (in years) 2 years 10 months 24 days 3 years 8 months 12 days
Remaining term, options exercisable (in years) 2 years 10 months 24 days  
Remaining term, options vested or expected to vest (in years) 2 years 10 months 24 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding | $ $ 8,753 $ 16,740
Exercised | $ 293  
Options exercisable | $ 8,753  
Vested or expected to vest | $ $ 8,753  
Service-Based Stock Option    
Options    
Outstanding, beginning of period (in shares) | shares 757,343  
Exercised (in shares) | shares (33,716)  
Outstanding, end of period (in shares) | shares 723,627 757,343
Options exercisable (in shares) | shares 723,627  
Vested or expected to vest (in shares) | shares 723,627  
Weighted-Average Exercise Price    
Outstanding, beginning of period (in dollars per share) | $ / shares $ 5.52  
Exercised (in dollars per share) | $ / shares 5.49  
Outstanding, end of period (in dollars per share) | $ / shares 5.52 $ 5.52
Options exercisable (in dollars per share) | $ / shares 5.52  
Vested or expected to vest (in dollars per share) | $ / shares $ 5.52  
Weighted-Average Remaining Contractual Term (Years)    
Remaining term, options outstanding (in years) 2 years 1 month 6 days 3 years
Remaining term, options exercisable (in years) 2 years 1 month 6 days  
Remaining term, options vested or expected to vest (in years) 2 years 1 month 6 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding | $ $ 3,751 $ 6,464
Exercised | $ 169  
Options exercisable | $ 3,751  
Vested or expected to vest | $ $ 3,751