Balance Sheet Components - Schedule of Cost and Accumulated Depreciation and Amortization of Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 60,669	$ 59,397
Less: accumulated depreciation and amortization	(40,091)	(37,409)
Property and equipment, net	20,578	21,988
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,106	22,489
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,824	12,672
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 24,739	$ 24,236