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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2016 | Jan. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 184,301 | $ 142,935
Accruals and reserves | 26,412 | 11,917
Stock-based compensation | 11,627 | 7,478
Depreciation and amortization | 6,217 | 3,329
Tax credit carryover | 4,002 | 4,005
Total deferred tax assets | 232,559 | 169,664
Valuation allowance | (232,211) | (167,436)
Total deferred tax assets, net of valuation allowance | 348 | 2,228
Deferred tax liabilities: |  |
Acquired intangible assets | (223) | (1,947)
Other | (61) |
Total deferred tax liabilities | (284) | (1,947)
Net deferred tax assets | $ 64 | $ 281

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