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)

v3.10.0.1
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 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Segment Reporting Information [Line Items]        
Total revenues $ 11,901 $ 17,225 $ 26,836 $ 33,892
North America [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 5,932 $ 8,320 $ 13,046 $ 16,646
North America [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 50.00% 48.00% 49.00% 49.00%
Europe and Middle East [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 3,858 $ 6,478 $ 9,881 $ 13,643
Europe and Middle East [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 32.00% 38.00% 37.00% 40.00%
Latin America [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 1,575 $ 2,142 $ 3,071 $ 2,863
Latin America [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 13.00% 12.00% 11.00% 9.00%
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 536 $ 285 $ 838 $ 740
Asia Pacific [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 5.00% 2.00% 3.00% 2.00%