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Net Loss Per Share Attributable to Common Stockholders - Anti-dilutive common equivalent shares (Details) - shares
6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 19,319,651 18,842,171
Restricted stock and restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 12,230,836 11,241,985
Shares estimated to be purchased under ESPP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 341,970 207,120
Performance-based restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 2,000,000 0
Common Stock | Options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive common equivalent shares (in shares) 4,746,845 7,393,066