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Stock-based compensation - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2022
shares
May 31, 2021
shares
Apr. 01, 2021
shares
Jul. 09, 2018
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2022
shares
Mar. 31, 2022
shares
Oct. 31, 2020
shares
Jun. 30, 2020
shares
Nov. 30, 2019
shares
Jul. 31, 2017
Stock-Based Compensation                      
Conversion ratio                     1
Number of stock warrants issued (in shares)       5,284,238       2,200,000 3,084,238 5,284,238  
Granted (in shares)   125,000,000       1,325,894          
Value of stock options exercised | $         $ 1.2            
2017 Plan                      
Stock-Based Compensation                      
Shares authorized (in shares)         2,659,885 2,659,885          
Number of shares available for grant       2,520,247 0 0          
2018 Plan                      
Stock-Based Compensation                      
Shares authorized (in shares)       3,617,968              
Number of shares available for grant         2,327,646 2,327,646          
Additional shares authorized (in shares) 2,104,915   2,074,028                
Share based payment award percentage of outstanding shares       4.00%              
ESPP                      
Stock-Based Compensation                      
Additional shares authorized (in shares) 526,228   518,507 697,224              
Share based payment award percentage of outstanding shares       1.00%              
Common stock reserved for issuance (in shares) 2,076,603   2,076,603 348,612              
Stock options                      
Stock-Based Compensation                      
Exercise price for persons holding ten percent of voting power (as a percent)         100.00% 100.00%          
Exercise price for persons holding more than ten percent of voting power (as a percent)         110.00% 110.00%          
Share based payment award expiration period           10 years          
Share based payment award vesting period           4 years          
Common stock reserved for issuance (in shares)         18,862,638 18,862,638 16,605,804        
Stock options | Maximum                      
Stock-Based Compensation                      
Expiration period for persons holding ten percent of voting power           5 years          
Stock options | Minimum                      
Stock-Based Compensation                      
Expiration period for persons holding more than ten percent of voting power           10 years          
Restricted stock units                      
Stock-Based Compensation                      
Share based payment award vesting period           4 years          
Restricted stock unit grant (in shares)           657,142          
Restricted stock units | Newly-Hired Executive                      
Stock-Based Compensation                      
Restricted stock unit grant (in shares)   88,333,000                  
Restricted stock units | Share-based Payment Arrangement, Tranche One                      
Stock-Based Compensation                      
Share based payment award vesting period           1 year