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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 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Segment Reporting Information [Line Items]        
Total revenues $ 19,961 $ 28,747 $ 59,983 $ 79,795
North America [Member]        
Segment Reporting Information [Line Items]        
Total revenues 9,116 14,659 28,306 44,447
Europe and Middle East [Member]        
Segment Reporting Information [Line Items]        
Total revenues 8,518 12,322 26,098 29,979
Latin America [Member]        
Segment Reporting Information [Line Items]        
Total revenues 1,334 1,433 3,785 3,884
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 993 $ 333 $ 1,794 $ 1,485
Customer Concentration Risk [Member] | Total Revenue [Member] | North America [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 45.00% 51.00% 47.00% 56.00%
Customer Concentration Risk [Member] | Total Revenue [Member] | Europe and Middle East [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 43.00% 43.00% 44.00% 37.00%
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 5.00% 1.00% 3.00% 2.00%