Composition of Certain Financial Statement Items - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment	$ 67,301		$ 67,301		$ 54,851
Less: Accumulated depreciation	(32,575)		(32,575)		(24,863)
Total Property and Equipment, Net	34,726		34,726		29,988
Depreciation expense	3,100	$ 2,800	8,600	$ 7,500
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	893		893		1,594
Computers and software
Property, Plant and Equipment [Line Items]
Property and equipment	5,786		5,786		5,384
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	14,776		14,776		10,605
Tooling
Property, Plant and Equipment [Line Items]
Property and equipment	10,506		10,506		7,705
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	10,644		10,644		9,398
Owned and operated systems
Property, Plant and Equipment [Line Items]
Property and equipment	21,236		21,236		17,703
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 3,460		$ 3,460		$ 2,462