Balance Sheet Components - Summary of Internal Use Software Costs (Details) - USD ($)		Jul. 31, 2019	Jan. 31, 2019
Property Plant And Equipment [Abstract]
Internal-use software costs, net	[1]	$ 9,804	$ 3,514
Capitalized qualifying implementation costs incurred in a hosting arrangement that is a service contract, net	[2]	$ 1,657	$ 1,663

[1] Included in these amounts were $3.2 million and $0.8 million in net capitalized stock-based compensation expense as of the respective period.

[2] Net capitalized stock-based compensation expense was not material for the periods presented.