Revenue and Contract Balances - Disaggregation of Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 45,750	$ 20,674	$ 83,145	$ 38,631
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	$ 31,207	$ 14,777	$ 57,383	$ 26,991
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue	68.00%	71.00%	69.00%	70.00%
International
Disaggregation of Revenue [Line Items]
Revenue	$ 14,543	$ 5,897	$ 25,762	$ 11,640
International | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue	32.00%	29.00%	31.00%	30.00%