Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheet Detail - Property and Equipment, Net (Detail)

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Consolidated Balance Sheet Detail - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 37,307 $ 36,771
Less - Accumulated depreciation and amortization (24,211) (22,642)
Total property and equipment, net 13,096 14,129
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,880 2,880
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 20  
Property, Plant and Equipment, Gross $ 12,010 11,908
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 5  
Property, Plant and Equipment, Gross $ 1,148 1,099
Computer Equipment, Software and Demonstration Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 3  
Property, Plant and Equipment, Gross $ 19,020 18,639
Service and Spare Components [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 5  
Property, Plant and Equipment, Gross $ 1,158 1,158
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,091 $ 1,087
Leasehold Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 1  
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 7