Revenues from Contracts with Customers - Schedule of Revenue Disaggregated by Revenue Stream (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 4,995	$ 18,812	$ 11,910	$ 27,297
Product [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,066	11,968	4,164	13,147
Professional Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	360	1,845	624	3,926
Maintenance [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 3,569	$ 4,999	$ 7,122	$ 10,224