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Stock-based compensation - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2021
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Mar. 31, 2023
Number of Shares              
Outstanding at beginning of the period (in shares)           7,454,828  
Granted (in shares) 125,000 125,000 82,500     2,064,526  
Exercised (in shares)           (163,356)  
Cancelled (in shares)           (200,611)  
Outstanding at end of the period (in shares)   9,155,387   9,155,387   9,155,387 7,454,828
Options exercisable (in shares)   5,400,346   5,400,346   5,400,346  
Options vested and expected to vest (in shares)           9,155,387  
Weighted Average Exercise Price              
Outstanding at beginning of the period (in dollars per share)           $ 17.24  
Granted (in dollars per share)           18.08  
Exercised (in dollars per share)           10.76  
Cancelled (in dollars per share)           24.73  
Outstanding at end of the period (in dollars per share)   $ 17.38   $ 17.38   17.38 $ 17.24
Options exercisable (in dollars per share)   15.28   15.28   15.28  
Options vested and expected to vest (in dollars per share)   $ 17.38   $ 17.38   $ 17.38  
Weighted Average Contractual Term (Years)              
Outstanding (years)           6 years 9 months 10 days 6 years 10 months 17 days
Options exercisable (years)           5 years 7 months 6 days  
Options vested and expected to vest (years)           6 years 9 months 10 days  
Aggregate Intrinsic Value              
Outstanding   $ 27,858   $ 27,858   $ 27,858 $ 31,244
Options exercisable   26,556   26,556   26,556  
Options vested and expected to vest   27,858   $ 27,858   27,858  
Stock-Based Compensation              
Weighted average grant-date fair value per share of stock options granted       $ 12.19 $ 12.20    
Stock options              
Stock-Based Compensation              
Total unrecognized compensation cost   $ 46,400   $ 46,400   $ 46,400  
Expenses expected to be recognized over a weighted average remaining period           2 years 8 months 12 days