Disaggregated Revenue and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 7,151	$ 4,966	$ 18,743	$ 16,876
United States Revenue [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 4,142	$ 1,408	$ 10,037	$ 5,413
Total Revenue [Member] | Customer Concentration Risk [Member] | United States Revenue [Member]
Segment Reporting Information [Line Items]
% of total revenue	58.00%	28.00%	54.00%	32.00%