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
9 Months Ended
Oct. 31, 2018
Jan. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 29,456 $ 29,858
Less - Accumulated depreciation and amortization (20,796) (20,387)
Total property and equipment, net 8,660 9,471
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,780 2,780
Estimated Useful Life (Years) P0Y  
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 11,861 11,839
Estimated Useful Life (Years) P20Y  
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 730 774
Estimated Useful Life (Years) P5Y  
Computer Equipment, Software and Demonstration Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 12,414 12,770
Estimated Useful Life (Years) P3Y  
Service and Spare Components [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,158 1,158
Estimated Useful Life (Years) P5Y  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 513 $ 537
Leasehold Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) P1Y  
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life (Years) P7Y