Acquisitions, Intangible Assets and Goodwill - Narrative (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($) company	Jan. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 8,449	$ 7,049	$ 0
Number of privately-held companies | company		2
Indefinite-lived trademark intangible assets acquired	400
Amortization expense	2,800	$ 900	$ 0
Patents
Business Acquisition [Line Items]
Intangible assets acquired	$ 7,900
Weighted-average useful life	5 years
Privately-Held Company
Business Acquisition [Line Items]
Cash paid for acquisition	$ 7,100
Goodwill	1,400	7,000
Consideration transferred		13,300
Net assets acquired		1,100
Deferred tax liability		(500)
Privately-Held Company | Developed technology
Business Acquisition [Line Items]
Intangible assets	$ 5,700	$ 5,600
Estimated useful life	5 years	5 years
Privately-Held Company | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangible assets		$ 100