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)

v3.7.0.1
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, 2017
Apr. 30, 2016
Segment Reporting Information [Line Items]    
Total revenues $ 16,667 $ 21,570
United States Revenue [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 7,028 $ 8,446
Total Revenues [Member] | Customer Concentration Risk [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 28.00% 32.00%
Total Revenues [Member] | Customer Concentration Risk [Member] | United States Revenue [Member]    
Segment Reporting Information [Line Items]    
% of total revenues 42.20% 39.20%