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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
May 31, 2021
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Number of Shares          
Outstanding at beginning of the period (in shares)     6,514,334    
Granted (in shares) 125,000,000   1,325,894    
Exercised (in shares)     (212,280)    
Cancelled (in shares)     (214,482)    
Outstanding at end of the period (in shares)   7,413,466 7,413,466   6,514,334
Options exercisable (in shares)   4,291,654 4,291,654   3,645,749
Weighted Average Exercise Price          
Outstanding at beginning of the period (in dollars per share)     $ 16.78    
Granted (in dollars per share)     18.15    
Exercised (in dollars per share)     12.58    
Cancelled (in dollars per share)     22.30    
Outstanding at end of the period (in dollars per share)   $ 16.98 16.98   $ 16.78
Options exercisable (in dollars per share)   $ 13.50 $ 13.50   $ 10.85
Weighted Average Contractual Term (Years)          
Outstanding (years)     7 years 3 months 21 days   7 years 3 months 3 days
Options exercisable (years)     6 years 3 months 21 days   6 years 3 months 21 days
Aggregate Intrinsic Value          
Outstanding   $ 30,477 $ 30,477   $ 30,358
Options exercisable   $ 26,428 26,428   $ 24,875
Stock-Based Compensation          
Weighted average grant-date fair value per share of stock options granted   $ 12.20   $ 22.25  
Stock options          
Stock-Based Compensation          
Total unrecognized compensation cost   $ 41,700 $ 41,700    
Expenses expected to be recognized over a weighted average remaining period     2 years 6 months