Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Computation of Loss Per Share (Detail)

v3.21.1
Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Computation of Loss Per Share (Detail) - shares
shares in Thousands
 3 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 2,073 905
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 1,897 766
Restricted Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 135 58
Deferred Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive potentially outstanding common shares 41 81