Goodwill and Intangible Assets - Schedule of Components of Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Apr. 30, 2017	Jan. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Value		$ 15,474	$ 15,474
Accumulated Amortization		(15,334)	(14,931)
Net Carrying Value		$ 140	$ 543
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		$ (14,273)	(13,908)
Net Carrying Value			$ 365
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		(1,061)	(1,023)
Net Carrying Value		$ 140	$ 178

[1] From the date of acquisition