Quarterly report pursuant to Section 13 or 15(d)

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

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Consolidated Balance Sheet Detail - Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Jan. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 20,947 $ 20,990
Less: Accumulated depreciation and amortization (13,968) (13,798)
Total property, plant and equipment, net 6,979 7,192
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,467 3,467
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,780 2,780
Computer Equipment, Software and Demonstration Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 12,326 12,316
Service and Spare Components [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,158 1,158
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 726 738
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 490 $ 531