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 (Parenthetical) (Detail)

v3.4.0.3
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Segment Reporting Information [Line Items]    
Total revenues $ 21,570 $ 23,177
United States Revenue [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 8,446 $ 11,935
United States Revenue [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]    
Segment Reporting Information [Line Items]    
% of total revenue 39.20% 51.50%