Annual report pursuant to Section 13 and 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
Jan. 31, 2019
Jan. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 20,990 $ 29,858
Less: Accumulated depreciation and amortization (13,798) (20,387)
Total property, plant and equipment, net 7,192 9,471
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,467 11,839
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 12,316 12,770
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 738 774
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 531 $ 537