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)

v3.7.0.1
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
Apr. 30, 2017
Apr. 30, 2016
Segment Reporting Information [Line Items]    
Total revenues $ 16,667 $ 21,570
North America [Member]    
Segment Reporting Information [Line Items]    
Total revenues 8,326 10,671
Europe and Middle East [Member]    
Segment Reporting Information [Line Items]    
Total revenues 7,165 9,141
Latin America [Member]    
Segment Reporting Information [Line Items]    
Total revenues 721 1,185
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 455 $ 573
Customer Concentration Risk [Member] | Total Revenues [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 28.00% 32.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | North America [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 50.00% 50.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | Europe and Middle East [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 43.00% 42.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | Latin America [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 4.00% 5.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 3.00% 3.00%