Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail)

v3.5.0.2
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) - Customer Concentration Risk [Member] - Total Revenue [Member]
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Customer A [Member]        
Revenue, Major Customer [Line Items]        
% of total revenues 28.00% 25.00% 30.00% 22.00%
Customer B [Member]        
Revenue, Major Customer [Line Items]        
% of total revenues   11.00%   14.00%
Customer C [Member]        
Revenue, Major Customer [Line Items]        
% of total revenues   11.00%