Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
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
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Segment Reporting Information [Line Items]      
Total revenues $ 106,992 $ 115,435 $ 146,319
Total Revenue [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
% of total revenue 10.00% 10.00% 10.00%
United States Revenue [Member]      
Segment Reporting Information [Line Items]      
Total revenues $ 46,978 $ 59,819 $ 66,903
United States Revenue [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
% of total revenue 43.90% 51.80% 45.70%