Balance Sheet Components - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Finite Lived Intangible Assets [Line Items]
Intangible assets, net	$ 6,560	$ 6,980
Intangible assets amortization expense	1,400	1,300	$ 800
Technology patents
Finite Lived Intangible Assets [Line Items]
Technology patents	10,125	9,125
Accumulated amortization	(3,565)	(2,145)
Intangible assets, net	$ 6,560	$ 6,980
Weighted average remaining useful life	4 years 90 days