Balance Sheet Components - Schedule of Expected Amortization Expenses for Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018	[1]
Balance Sheet Components Disclosure [Abstract]
Remainder of 2019	$ 752
2020	1,504
2021	1,504
2022	545
Intangible assets, net	$ 4,305	$ 5,057

[1] *Prior period information has been adjusted to reflect the adoption impact of Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606), which we adopted on February 1, 2018.