Sales and Major Customers - Summary of Company's Revenues from Customers by Geographic Region, Outside the U.S. (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Revenue, Major Customer [Line Items]
Total revenues	$ 21,215	$ 29,919
Total
Revenue, Major Customer [Line Items]
Total revenues	17,528	25,999
UK/Europe
Revenue, Major Customer [Line Items]
Total revenues	8,005	14,975
Canada
Revenue, Major Customer [Line Items]
Total revenues	1,267	3,519
Latin America
Revenue, Major Customer [Line Items]
Total revenues	0	262
Asia/South Pacific
Revenue, Major Customer [Line Items]
Total revenues	6,523	5,377
Eurasia
Revenue, Major Customer [Line Items]
Total revenues	507	290
Other
Revenue, Major Customer [Line Items]
Total revenues	$ 1,226	$ 1,576