Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 27,825	$ 10,125
Accumulated Amortization	(6,699)	(5,068)
Net Carrying Amount	21,126	5,057	[1]
Technology patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	10,125	10,125
Accumulated Amortization	(6,196)	(5,068)
Net Carrying Amount	3,929	5,057
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	17,700	0
Accumulated Amortization	(503)	0
Net Carrying Amount	$ 17,197	$ 0

[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.