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

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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