Composition of Certain Financial Statement Items - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 65,034	$ 36,365	$ 161,665	$ 104,098
United States
Disaggregation of Revenue [Line Items]
Total revenue	54,561	29,681	139,321	92,319
Rest of World
Disaggregation of Revenue [Line Items]
Total revenue	$ 10,473	$ 6,684	$ 22,344	$ 11,779