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Net Loss Per Share Attributable to Common Stockholders - Anti-dilutive common equivalent shares (Details) - shares
6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 18,842,171 21,286,193
Restricted stock and restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 11,241,985 9,998,039
Shares estimated to be purchased under ESPP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 207,120 336,113
Common Stock | Options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 7,393,066 10,952,041