Income Taxes Income Taxes (Tables)
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12 Months Ended |
Dec. 31, 2015 |
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| Income Tax Disclosure [Abstract] |
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| Schedule of Income before Income Tax |
The components of loss from continuing operations before income taxes were generated solely in the United States as follows (in thousands): | | | | | | | | | | | | | | Year Ended December 31, | | 2015 | | 2014 | | 2013 | United States | $ | (79,920 | ) | | $ | (85,940 | ) | | $ | (62,182 | ) |
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| Schedule of Effective Income Tax Rate Reconciliation |
Reconciliations of the statutory federal income tax rate and our effective tax rate consist of the following (in thousands): | | | | | | | | | | | | | | Year Ended December 31, | | 2015 | | 2014 | | 2013 | Tax at federal statutory rate | $ | (27,173 | ) | | $ | (29,220 | ) | | $ | (21,142 | ) | State statutory rate (net of federal benefit) | (1,560 | ) | | (1,728 | ) | | (1,921 | ) | Non-deductible stock compensation | 2,334 |
| | (19 | ) | | 619 |
| Change in valuation allowance | 24,332 |
| | 30,571 |
| | 22,184 |
| Other | 2,067 |
| | 396 |
| | 260 |
| | $ | — |
| | $ | — |
| | $ | — |
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| Schedule of Deferred Tax Assets and Liabilities |
Significant components of our deferred tax assets and liabilities were as follows (in thousands): | | | | | | | | | | As of December 31, | Deferred tax assets: | 2015 | | 2014 | Net operating loss carryforwards | $ | 93,165 |
| | $ | 72,984 |
| Deferred rent | 235 |
| | 127 |
| Accrued bonus | — |
| | 68 |
| Accrued compensation | 326 |
| | 539 |
| Stock-based compensation | 6,224 |
| | 3,266 |
| Other reserves and accruals | 4 |
| | 2 |
| Property and equipment | 322 |
| | 16 |
| Deferred revenue | 3,017 |
| | 2,173 |
| | 103,293 |
| | 79,175 |
| Valuation allowance | (103,293 | ) | | (79,175 | ) | Net deferred tax assets | $ | — |
| | $ | — |
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| Schedule of Unrecognized Tax Benefits Roll Forward |
A reconciliation of the beginning and ending amount of the gross unrecognized tax benefit is as follows (in thousands): | | | | | | | | | | | | | | Year Ended December 31, | | 2015 | | 2014 | | 2013 | Gross unrecognized tax benefits at the beginning of the year | $ | 7,214 |
| | $ | 4,513 |
| | $ | 2,445 |
| Increases for tax positions of prior years | 133 |
| | 871 |
| | — |
| Decreases for tax positions of prior years | (346 | ) | | (831 | ) | | — |
| Increases for tax positions related to the current year | 2,539 |
| | 2,661 |
| | 2,068 |
| Gross unrecognized tax benefits at the end of the year | $ | 9,540 |
| | $ | 7,214 |
| | $ | 4,513 |
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