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
Jul. 31, 2019
Jan. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross $ 20,535 $ 20,990
Less: Accumulated depreciation and amortization (13,647) (13,798)
Total property and equipment, net 6,888 7,192
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 3,467 3,467
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 2,780 2,780
Computer Equipment, Software and Demonstration Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 11,868 12,316
Service and Spare Components [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 1,158 1,158
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 738 738
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross $ 524 $ 531