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, 2020
Jan. 31, 2020
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 10,261 $ 11,177
Less: Accumulated depreciation and amortization (9,625) (10,623)
Total property and equipment, net 636 554
Computer Equipment, Software and Demonstration Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 9,748 9,695
Service and Spare Components [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross   1,158
Office Furniture and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross 307 170
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 206 $ 154