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
 3 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 30,258 $ 29,858
Less - Accumulated depreciation and amortization (21,084) (20,387)
Total property and equipment, net 9,174 9,471
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,780 2,780
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 20  
Property, Plant and Equipment, Gross $ 11,852 11,839
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 5  
Property, Plant and Equipment, Gross $ 766 774
Computer Equipment, Software and Demonstration Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) 3  
Property, Plant and Equipment, Gross $ 13,178 12,770
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 $ 524 $ 537
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