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)

v3.8.0.1
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) - Customer Concentration Risk [Member] - Total Revenues [Member]
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Customer A [Member]    
Entity Wide Revenue Major Customer [Line Items]    
% of total revenues 19.00% 25.00%
Customer B [Member]    
Entity Wide Revenue Major Customer [Line Items]    
% of total revenues 10.00%