Property and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 02, 2020	Feb. 03, 2019	Jan. 28, 2018
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization		$ 42,453
Depreciation expense	$ 22,000	17,900	$ 9,500
Internal-use software
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	15,900	9,700
Amortization expense	$ 8,600	$ 5,300	$ 3,000