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Income Taxes (Tables) | 12 Months Ended
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Jan. 31, 2016
Income Tax Disclosure [Abstract] |
Schedule of Loss Before Provision (Benefit) For Income | The components of loss before provision (benefit) for income taxes were as follows (in thousands):
|  | Year Ended January 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
United States |  | $ | (155,794 | ) |  | $ | (132,084 | ) |  | $ | (148,032 | )
Foreign |  |  | (46,464 | ) |  |  | (36,712 | ) |  |  | (22,956 | )
Total |  | $ | (202,258 | ) |  | $ | (168,796 | ) |  | $ | (170,988 | )
Schedule of Provision (Benefit) For Income Taxes | The components of the provision (benefit) for income taxes were as follows (in thousands):
|  | Year Ended January 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 29 |  |  | $ | 25 |  |  | $ | 17 |
State |  |  | 146 |  |  |  | 135 |  |  |  | 53 |
Foreign |  |  | 298 |  |  |  | 670 |  |  |  | 89 |
Total |  | $ | 473 |  |  | $ | 830 |  |  | $ | 159 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 61 |  |  | $ | (1,009 | ) |  | $ | (2,360 | )
State |  |  | — |  |  |  | (109 | ) |  |  | (230 | )
Foreign |  |  | 156 |  |  |  | (281 | ) |  |  | — |
Total |  | $ | 217 |  |  | $ | (1,399 | ) |  | $ | (2,590 | )
Provision (benefit) for income taxes |  | $ | 690 |  |  | $ | (569 | ) |  | $ | (2,431 | )
Schedule of Reconciliation of The Federal Statutory Income Tax Rate And The Provision For Income Taxes | The items accounting for the difference between income taxes computed at the federal statutory income tax rate of 34% and the provision for income taxes consisted of the following (in thousands):
|  | Year Ended January 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
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 for income taxes |  | $ | 690 |  |  | $ | (569 | ) |  | $ | (2,431 | )
Schedule of Components of Deferred Tax Assets and Liabilities | The significant components of our deferred tax assets and liabilities were as follows (in thousands):
|  | January 31, |
|  | 2016 |  |  | 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 |
Schedule of Reconciliation of Unrecognized Tax Benefit | A reconciliation of the gross unrecognized tax benefits is as follows (in thousands):
|  | Year Ended January 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Unrecognized tax benefits—beginning of period |  | $ | 13,607 |  |  | $ | 8,147 |  |  | $ | 2,515 |
Additions for tax positions related to prior year |  |  | 238 |  |  |  | 43 |  |  |  | 547 |
Reductions for tax positions related to prior year |  |  | — |  |  |  | (19 | ) |  |  | — |
Additions for tax positions related to current year |  |  | 6,811 |  |  |  | 5,436 |  |  |  | 5,085 |
Unrecognized tax benefits—end of period |  | $ | 20,656 |  |  | $ | 13,607 |  |  | $ | 8,147 |

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