Revenue and Contract Balances - Disaggregation of Revenue by Geography (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]
Revenue	$ 56,018	$ 24,557	$ 139,163	$ 63,188
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 37,423	$ 17,369	$ 94,806	$ 44,360
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue	67.00%	71.00%	68.00%	70.00%
International
Disaggregation of Revenue [Line Items]
Revenue	$ 18,595	$ 7,188	$ 44,357	$ 18,828
International | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue	33.00%	29.00%	32.00%	30.00%