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Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail)

v3.2.0.727
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 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Segment Reporting Information [Line Items]        
Total revenues $ 27,871 $ 29,849 $ 51,048 $ 54,186
United States Revenue [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 11,794 $ 17,979 $ 23,729 $ 31,447
United States Revenue [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 42.30% 60.20% 46.50% 58.00%