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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Loss Before Income Tax Provision | Loss before income tax provision (benefit) consisted of the following (in thousands):
| For the year ended December 31,
| 2017 |  | 2016 |  | 2015
United States | $ | (44,246) |  | $ | (43,952) |  | $ | (42,788)
Foreign | (119) |  | (1) |  | (618)
Total | $ | (44,365) |  | $ | (43,953) |  | $ | (43,406)
Schedule of Provision (Benefit) for Income Taxes | The provision (benefit) for income taxes consisted of the following (in thousands):
| For the year ended December 31,
| 2017 |  | 2016 |  | 2015
Current |  |  |  |  |
State | $ | 42 |  | $ | 12 |  | $ | 69
Foreign | 19 |  | 44 |  | —
Total Current | $ | 61 |  | $ | 56 |  | $ | 69
Deferred |  |  |  |  |
Federal | $ | — |  | $ | (32) |  | $ | (76)
Total Deferred | $ | — |  | $ | (32) |  | $ | (76)
Total | $ | 61 |  | $ | 24 |  | $ | (7)
Schedule of Effective Income Tax Rate Reconciliation | The items accounting for the difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes consisted of the following (in thousands):
| For the year ended December 31,
| 2017 |  | 2016 |  | 2015
Federal statutory rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Effect of: |  |  |  |  |
Tax benefit at federal statutory rate | $ | (15,528) |  | $ | (15,384) |  | $ | (15,192)
State taxes, net of federal benefit | (1,802) |  | (1,377) |  | (1,833)
Revaluation of deferred tax items due to tax rate change (federal and state) | 22,880 |  | — |  | —
Revaluation of deferred tax asset for current year net operating loss due to tax rate change | 4,134 |  | — |  | —
Permanent differences including section 162(m) limitations, stock compensation, gain on foreign restructuring, and meals & entertainment | 5,141 |  | 1,292 |  | 636
Tax benefit of federal R&D credit | (2,366) |  | (1,781) |  | (1,270)
Recognition of excess tax benefits related to share-based payments | (3,606) |  | — |  | —
Valuation allowance | (8,586) |  | 17,013 |  | 17,697
Other | (206) |  | 261 |  | (45)
Total income tax provision | $ | 61 |  | $ | 24 |  | $ | (7)
Schedule of Deferred Tax Assets and Liabilities | The components of deferred tax assets and liabilities were as follows (in thousands):
| As of December 31,
| 2017 |  | 2016
Deferred tax assets: |  |  |
Property and equipment | $ | 15 |  | $ | 12
Accruals and reserves | 199 |  | 1,104
Deferred rent | 931 |  | 1,565
Compensation and benefits | 11,973 |  | 16,048
Deferred revenue | 4,762 |  | 3,255
Net operating loss and credits | 41,108 |  | 45,625
Other | 167 |  | 180
Total deferred tax assets | 59,155 |  | 67,789
Valuation allowance | (58,639) |  | (67,225)
Total deferred tax assets | 516 |  | 564
Deferred tax liabilities: |  |  |
Property and equipment | (440) |  | (403)
Other deferred tax liabilities | (76) |  | (161)
Deferred tax liabilities | (516) |  | (564)
Total | $ | — |  | $ | —
Schedule of Unrecognized Tax Benefits | A reconciliation of the gross unrecognized tax benefits is as follows (in thousands):
| For the year ended December 31,
| 2017 |  | 2016
Unrecognized tax benefits-beginning of period | $ | 168 |  | $ | —
Additions for tax positions related to prior year | — |  | 168
Reductions for tax positions related to prior year | — |  | —
Foreign currency adjustments | 23 |  | —
Additions for tax positions related to current year | — |  | —
Unrecognized tax benefits-end of period | $ | 191 |  | $ | 168

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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