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)

v3.19.1
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
Apr. 30, 2019
Apr. 30, 2018
Segment Reporting Information [Line Items]    
Total revenue $ 8,485 $ 14,935
Customer Concentration Risk [Member] | Total Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 17.00%  
North America [Member]    
Segment Reporting Information [Line Items]    
Total revenue $ 4,089 $ 7,114
North America [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 49.00% 48.00%
Europe and Middle East [Member]    
Segment Reporting Information [Line Items]    
Total revenue $ 2,970 $ 6,023
Europe and Middle East [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 35.00% 40.00%
Latin America [Member]    
Segment Reporting Information [Line Items]    
Total revenue $ 1,047 $ 1,496
Latin America [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 12.00% 10.00%
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Total revenue $ 379 $ 302
Asia Pacific [Member] | Customer Concentration Risk [Member] | Total Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 4.00% 2.00%