Revenue from Contracts with Customers - Revenue Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 5,086	$ 6,820	$ 8,273	$ 12,727
United States
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	686	1,084	1,786	1,841
Europe, Russia & CIS
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,604	2,563	2,980	5,167
Middle East & Africa
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	221	358	297	549
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,222	1,910	2,499	3,108
Canada & Latin America
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 353	$ 905	$ 711	$ 2,062