Acquisitions, Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 8,449		$ 8,449		$ 7,049
Amortization expense	900	$ 300	1,900	$ 600
Patents
Business Acquisition [Line Items]
Intangible assets acquired			$ 6,200
Weighted-average useful life			5 years
Privately-Held Company
Business Acquisition [Line Items]
Cash paid for acquisition			$ 7,100
Goodwill	1,400		1,400
Privately-Held Company | Developed technology
Business Acquisition [Line Items]
Intangible assets	$ 5,700		$ 5,700
Estimated useful life			5 years