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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)

v3.3.1.900
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 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Segment Reporting Information [Line Items]        
Total revenues $ 28,747 $ 29,970 $ 79,795 $ 84,156
United States Revenue [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 11,880 $ 14,608 $ 35,609 $ 46,055
United States Revenue [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
% of total revenues 41.30% 48.70% 44.60% 54.70%