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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