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
Oct. 31, 2019
Jan. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross $ 17,799 $ 20,990
Less: Accumulated depreciation and amortization (11,222) (13,798)
Total property and equipment, net 6,577 7,192
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross 3,467 3,467
Total property and equipment, net 5,900  
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 9,804 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 437 738
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, Gross $ 153 $ 531