Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation - Stock options (Details)

v3.21.2
Stock-based compensation - Stock options (Details)
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Jun. 12, 2021
Jun. 11, 2021
Jul. 31, 2021
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Apr. 30, 2020
Jun. 11, 2021
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Financial Designation, Predecessor and Successor [Fixed List] Successor Predecessor Successor Successor Predecessor Predecessor Predecessor Predecessor Successor Predecessor Predecessor Predecessor
Stock Options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting term                 4 years      
Term of options                 10 years      
Stock Options | Days following termination of employment or service                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration term                 90 days      
Stock Options | Months following an optionees' death or disability                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration term                 12 months