Composition of Certain Financial Statement Items - Summary of Property Plant and Equipment Net (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 57,813	$ 54,851
Less: Accumulated depreciation	(26,602)	(24,863)
Total Property and Equipment, Net	31,211	29,988
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	901	1,594
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,394	5,384
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	11,583	10,605
Tooling [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	7,991	7,705
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	9,582	9,398
Owned and operated systems [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	19,733	17,703
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,629	$ 2,462