Revenue from Contracts with Customers - Contract Assets And Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Jan. 31, 2019
Contract Assets:
Unbilled revenue-current	$ 345	$ 340
Unbilled revenue - non-current	0	0
Total unbilled revenue	345	340
Contract Liabilities:
Deferred revenue & customer deposits - current	535	556
Deferred revenue & customer deposits - non-current	9	11
Total deferred revenue & customer deposits	$ 544	$ 567
Minimum
Contract With Customers [Line Items]
Contract with customers, turn over period	3 months
Maximum
Contract With Customers [Line Items]
Contract with customers, turn over period	6 months