v3.26.3
Stock-based compensation - Stock option activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Number of Shares    
Outstanding at beginning of the period (in shares) | shares 11,785,458  
Granted (in shares) | shares 2,444,528  
Exercised (in shares) | shares (770,895)  
Cancelled (in shares) | shares (2,185,558)  
Outstanding at end of the period (in shares) | shares 11,273,533 11,785,458
Options exercisable (in shares) | shares 7,523,534  
Options vested and expected to vest (in shares) | shares 11,273,533  
Weighted Average Exercise Price    
Outstanding at beginning of the period (in dollars per share) | $ / shares $ 14.12  
Granted (in dollars per share) | $ / shares 8.41  
Exercised (in dollars per share) | $ / shares 7.48  
Cancelled (in dollars per share) | $ / shares 16.58  
Outstanding at end of the period (in dollars per share) | $ / shares 12.86 $ 14.12
Options exercisable (in dollars per share) | $ / shares 14.82  
Options vested and expected to vest (in dollars per share) | $ / shares $ 12.86  
Weighted Average Contractual Term (Years)    
Outstanding (years) 5 years 10 months 20 days 5 years 7 months 17 days
Options exercisable (years) 4 years 4 months 24 days  
Options vested and expected to vest (years) 5 years 10 months 20 days  
Aggregate Intrinsic Value    
Outstanding | $ $ 36,823 $ 4,323
Options exercisable | $ 19,464  
Options vested and expected to vest | $ $ 36,823