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Common Stock and Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2021
Jan. 31, 2021
Number of Shares    
Outstanding, beginning balance (in shares) 11,177,838  
Granted (in shares) 32,428  
Exercised (in shares) (536,593)  
Canceled (in shares) (40,185)  
Outstanding, ending balance (in shares) 10,633,488 11,177,838
Weighted Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 8.25  
Granted (in dollars per share) 41.17  
Exercised (in dollars per share) 5.23  
Canceled (in dollars per share) 9.09  
Outstanding, ending balance (in dollars per share) $ 8.50 $ 8.25
Weighted Average Remaining Contractual Term    
Outstanding 6 years 8 months 12 days 6 years 10 months 24 days
Aggregate Intrinsic Value    
Outstanding $ 361,089 $ 452,452
Vested    
Number of shares (in shares) 7,447,293  
Weighted average exercise price (in dollars per share) $ 6.00  
Weighted average remaining contractual term 6 years 2 months 12 days  
Aggregate intrinsic value $ 271,497