Revenue from Contracts with Customers - Contract Assets And Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Contract Assets:
Unbilled revenue-current	$ 85	$ 13
Unbilled revenue - non-current	0	0
Total unbilled revenue	85	13
Contract Liabilities:
Deferred revenue & customer deposits - current	691	220
Deferred revenue & customer deposits - non-current	0	12
Total deferred revenue & customer deposits	$ 691	$ 232
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)	6 months