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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)

v2.4.0.8
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, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Segment Reporting Information [Line Items]        
Total revenues $ 29,970 $ 37,771 $ 84,156 $ 110,703
United States Revenue [Member]
       
Segment Reporting Information [Line Items]        
Total revenues $ 14,608 $ 18,461 $ 46,055 $ 54,099
United States Revenue [Member] | Sales [Member]
       
Segment Reporting Information [Line Items]        
% of total revenues 48.70% 48.90% 54.70% 48.90%