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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)