Net Loss Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Loss Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive potentially outstanding common shares	2,364	1,351
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive potentially outstanding common shares	2,233	1,290
Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive potentially outstanding common shares	55	51
Deferred Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive potentially outstanding common shares	76	10