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Stock-based compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Number of Options      
Outstanding (in shares)   4,034,287  
Granted (in shares) 0 0  
Exercised (in shares)   (8,978)  
Cancelled/Forfeited (in shares)   (21,808)  
Outstanding (in shares) 4,003,501 4,003,501 4,034,287
Options exercisable (in shares) 2,722,036 2,722,036  
Options vested and expected to vest (in shares) 4,003,501 4,003,501  
Weighted-Average Exercise Price      
Outstanding (in usd per share)   $ 6.90  
Granted (in usd per share)   0  
Exercised (in usd per share)   3.92  
Cancelled/Forfeited (in usd per share)   8.11  
Outstanding (in usd per share) $ 6.90 6.90 $ 6.90
Options exercisable (in usd per share) 6.14 6.14  
Options vested and expected to vest (in usd per share) $ 6.90 $ 6.90  
Weighted Average Remaining Contractual Term      
Outstanding   6 years 3 months 18 days 6 years 10 months 24 days
Exercisable   5 years 4 months 24 days  
Vested and expected to vest   6 years 3 months 18 days  
Aggregate Intrinsic Value      
Outstanding $ 0 $ 0 $ 1,625
Exercisable 0 0  
Vested and expected to vest $ 0 $ 0