Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 26,629	$ 18,778
Less: Accumulated depreciation and amortization	(7,737)	(5,405)
Property and equipment, net	18,892	13,373
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	1,432	837
Computers, software, and electronic equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	4,521	3,489
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Total property and equipment	13,033	6,959
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	7,643	4,568
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 0	$ 2,925