Income Taxes - Reconciliation of Unrecognized Tax Position (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 2,778	$ 1,976	$ 1,205
Increases related to current years’ tax positions	5,328	802	771
Ending Balance	$ 8,106	$ 2,778	$ 1,976