Revenue from Contracts with Customers - Contract Assets And Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Jan. 31, 2020
Contract Assets:
Unbilled revenue - current	$ 4	$ 13
Total unbilled revenue	4	13
Contract Liabilities:
Deferred revenue & customer deposits - current	79	220
Deferred revenue & customer deposits - non-current	0	12
Total deferred revenue & customer deposits	$ 79	$ 232
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