Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 88,055	$ 72,373	$ 173,406	$ 141,081
North America
Disaggregation of Revenue [Line Items]
Revenue	71,171	59,941	140,398	116,453
International
Disaggregation of Revenue [Line Items]
Revenue	$ 16,884	$ 12,432	$ 33,008	$ 24,628