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Equity Plans and Stock-based Compensation - Summary of Equity Plans Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2021
Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock option awards outstanding beginning balance 30,166,792  
Number of stock option awards forfeited (353,478)  
Number of stock option awards expired (17,350)  
Number of stock option awards outstanding ending balance 29,795,964 30,166,792
Number of stock option awards options vested and expected to vest 29,795,964  
Number of stock option awards exercisable 18,248,059  
Weighted average exercise price outstanding beginning balance $ 0.71  
Weighted average exercise price forfeited 0.74  
Weighted average exercise price expired 58.74  
Weighted average exercise price outstanding ending balance 0.67 $ 0.71
Weighted average exercise price options vested and expected to vest 0.67  
Weighted average exercise price exercisable $ 0.64  
Weighted average remaining contractual term 6 years 10 months 24 days 7 years 3 months 18 days
Weighted average remaining contractual term options vested and expected to vest 6 years 10 months 24 days  
Weighted average remaining contractual term exercisable 6 years  
Aggregate intrinsic value outstanding $ 734,460 $ 1,064,539
Aggregate intrinsic value options vested and expected to vest 734,460  
Aggregate intrinsic value exercisable $ 450,546