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 (Detail)

v3.8.0.1
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Segment Reporting Information [Line Items]      
Total revenues $ 80,267 $ 83,795 $ 106,992
North America [Member]      
Segment Reporting Information [Line Items]      
Total revenues 32,409 37,570 58,113
Europe and Middle East [Member]      
Segment Reporting Information [Line Items]      
Total revenues 39,177 38,169 42,201
Latin America [Member]      
Segment Reporting Information [Line Items]      
Total revenues 7,379 5,764 4,707
Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
Total revenues $ 1,302 $ 2,292 $ 1,971
Customer Concentration Risk [Member] | Total Revenues [Member]      
Segment Reporting Information [Line Items]      
% of total revenues 10.00% 10.00% 10.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | North America [Member]      
Segment Reporting Information [Line Items]      
% of total revenues 40.00% 45.00% 55.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | Europe and Middle East [Member]      
Segment Reporting Information [Line Items]      
% of total revenues 49.00% 45.00% 39.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | Latin America [Member]      
Segment Reporting Information [Line Items]      
% of total revenues 9.00% 7.00% 4.00%
Customer Concentration Risk [Member] | Total Revenues [Member] | Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
% of total revenues 2.00% 3.00% 2.00%