Revenue from Contracts with Customers - Revenue Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 8,065	$ 9,305	$ 20,792	$ 19,025
United States
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,376	1,104	3,217	2,356
Europe, Russia & CIS
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,650	5,629	8,817	10,395
Middle East & Africa
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	810	515	1,359	1,151
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,257	1,820	4,365	4,499
Canada & Latin America
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 972	$ 237	$ 3,034	$ 624