Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail)

v3.19.2
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Segment Reporting Information [Line Items]        
Total revenue $ 18,812 $ 11,901 $ 27,297 $ 26,836
North America [Member]        
Segment Reporting Information [Line Items]        
Total revenue $ 11,567 $ 5,932 $ 15,656 $ 13,046
North America [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 62.00% 50.00% 57.00% 49.00%
Europe and Middle East [Member]        
Segment Reporting Information [Line Items]        
Total revenue $ 2,724 $ 3,858 $ 5,694 $ 9,881
Europe and Middle East [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 14.00% 32.00% 21.00% 37.00%
Latin America [Member]        
Segment Reporting Information [Line Items]        
Total revenue $ 4,132 $ 1,575 $ 5,179 $ 3,071
Latin America [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 22.00% 13.00% 19.00% 11.00%
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Total revenue $ 389 $ 536 $ 768 $ 838
Asia Pacific [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 2.00% 5.00% 3.00% 3.00%