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Equity Plans and Stock-based Compensation - Stock Option Activity (Details) - USD ($)
9 Months Ended 12 Months Ended
Oct. 31, 2021
Jan. 31, 2021
Number of Stock Option Awards    
Outstanding as of beginning of period (in shares) 30,166,792  
Options exercised (in shares) (4,666,083)  
Forfeited (in shares) (624,618)  
Expired (in shares) (21,048)  
Outstanding as end of period (in shares) 24,855,043 30,166,792
Options vested and expected to vest at end of period (in shares) 24,314,890  
Exercisable at end of period (in shares) 16,523,251  
Weighted Average Exercise Price    
Outstanding as of beginning of period (USD per share) $ 0.71  
Options exercised (USD per share) 0.59  
Forfeited (USD per share) 0.74  
Expired (USD per share) 53.26  
Outstanding as of end of period (USD per share) 0.69 $ 0.71
Options vested and expected to vest as of end of period (USD per share) 0.68  
Exercisable as of end of period (USD per share) $ 0.66  
Weighted Average Remaining Contractual term (in years)    
Outstanding (in years) 6 years 9 months 18 days 7 years 3 months 18 days
Options vested and expected to ves (in years) 6 years 8 months 12 days  
Exercisable (in years) 6 years 2 months 12 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding $ 598,912 $ 1,064,539
Options vested and expected to vest 585,934  
Exercisable $ 398,582