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Net Loss Per Share Attributable to Common Stockholders - Anti-dilutive common equivalent shares (Details) - shares
9 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 18,226,103 20,202,899
Restricted stock and restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 10,912,675 10,406,910
Shares estimated to be purchased under ESPP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 282,162 331,129
Common Stock | Options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 7,031,266 9,464,860