Revenue from Contracts with Customers - Contract Assets And Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Jan. 31, 2021
Contract Assets:
Unbilled revenue - current	$ 136	$ 85
Total unbilled revenue	136	85
Contract Liabilities:
Deferred revenue & customer deposits - current	681	691
Deferred revenue & customer deposits - non-current	0	0
Total deferred revenue & customer deposits	$ 681	$ 691
Minimum
Contract With Customers [Line Items]
Contract with customers, turn over period (in months)	3 months
Maximum
Contract With Customers [Line Items]
Contract with customers, turn over period (in months)	9 months