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

v3.5.0.2
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, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Segment Reporting Information [Line Items]        
Total revenues $ 18,452 $ 27,871 $ 40,022 $ 51,048
North America [Member]        
Segment Reporting Information [Line Items]        
Total revenues 8,520 16,010 19,191 29,789
Europe and Middle East [Member]        
Segment Reporting Information [Line Items]        
Total revenues 8,439 10,090 17,580 17,656
Latin America [Member]        
Segment Reporting Information [Line Items]        
Total revenues 1,265 1,354 2,450 2,452
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 228 $ 417 $ 801 $ 1,151
Customer Concentration Risk [Member] | Total Revenue [Member] | North America [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 46.00% 58.00% 48.00% 58.00%
Customer Concentration Risk [Member] | Total Revenue [Member] | Europe and Middle East [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 46.00% 36.00% 44.00% 35.00%
Customer Concentration Risk [Member] | Total Revenue [Member] | Latin America [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 7.00% 5.00% 6.00% 5.00%
Customer Concentration Risk [Member] | Total Revenue [Member] | Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 1.00% 1.00% 2.00% 2.00%