Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 4,305	$ 5,057	[1]
Technology patents
Finite-Lived Intangible Assets [Line Items]
Technology patents	10,125	10,125
Accumulated amortization	(5,820)	(5,068)
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.