Income Taxes - Schedule of Reconciliation Between the Provision (Benefit) for Income Taxes at the Statutory Rate and the Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Tax Disclosure [Abstract]
Provision at U.S. notional statutory rate	$ (12,034)	$ (8,742)	$ (7,256)
U.S. state taxes	212	3	2
Non-U.S. foreign tax differential	12,989	10,458	9,226
Stock-based compensation	4,943	4,172	4,715
U.S. R&D credit	(3,928)	(3,109)	(2,770)
Valuation allowance	0	0	(7,990)
Other	301	382	(32)
Provision (benefit) for income taxes	$ 2,483	$ 3,164	$ (4,105)