Balance Sheet Components - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance as of January 31, 2018	$ 0	[1]
Goodwill acquired	10,997
Balance as of October 31, 2018	$ 10,997

[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.