Goodwill and Intangible Assets - Schedule of Components of Intangible Assets (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jul. 31, 2016	Jan. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Value		$ 15,474	$ 15,474
Accumulated Amortization		(13,954)	(11,579)
Net Carrying Value		$ 1,520	$ 3,895
Developed Technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	[1]	2 years 6 months	2 years 6 months
Gross Value		$ 14,273	$ 14,273
Accumulated Amortization		(13,009)	(10,711)
Net Carrying Value		$ 1,264	$ 3,562
Trade name and other
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	[1]	6 years 10 months 24 days	6 years 10 months 24 days
Gross Value		$ 1,201	$ 1,201
Accumulated Amortization		(945)	(868)
Net Carrying Value		$ 256	$ 333

[1] From the date of acquisition