Revenue from Contracts with Customers - Contract Assets And Liabilities (Detail) $ in Thousands	6 Months Ended
	Jul. 31, 2018 USD ($)
Contract Assets:
Unbilled revenue-current	$ 341
Unbilled revenue - non-current	0
Total unbilled revenue	341
Contract Liabilities:
Deferred revenue & customer deposits - current	934
Deferred revenue & customer deposits - non-current	8
Total deferred revenue & customer deposits	$ 942
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