Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 4,057	$ 2,407	$ 933
Increases based on tax positions during the prior period	35	0	0
Increases based on tax positions during the current period	15,257	1,650	1,474
Ending balance	$ 19,349	$ 4,057	$ 2,407