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, 2020
Jan. 31, 2019
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 11,177 $ 20,990
Less: Accumulated depreciation and amortization (10,623) (13,798)
Total property and equipment, net 554 7,192
Buildings [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 3,500 3,467
Land [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross   2,780
Computer Equipment, Software and Demonstration Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 9,695 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 170 738
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 154 $ 531