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Income Taxes - Schedule of Reconciliation of The Federal Statutory Income Tax Rate And The Provision For Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Tax benefit at federal statutory rate	$ (68,767)	$ (57,391)	$ (58,136)
State taxes, net of federal benefit	(8,799)	(5,322)	(5,071)
Foreign rate difference	6,744	4,043	3,270
Nondeductible expenses	429	451	3,408
Research and development credit	(3,533)	(2,396)	(1,934)
Stock-based compensation	6,214	4,703	2,644
Change in reserve for unrecognized tax benefits	3,562	2,421	3,937
Other	61	709	(421)
Change in valuation allowance	64,779	52,213	49,872
Provision (benefit) for income taxes	$ 690	$ (569)	$ (2,431)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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