Revenue from Contracts with Customers - Contract Assets And Liabilities (Detail) $ in Thousands	9 Months Ended
	Oct. 31, 2018 USD ($)
Contract Assets:
Unbilled revenue-current	$ 2,435
Unbilled revenue - non-current	0
Total unbilled revenue	2,435
Contract Liabilities:
Deferred revenue & customer deposits - current	521
Deferred revenue & customer deposits - non-current	6
Total deferred revenue & customer deposits	$ 527
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