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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Taxes [Abstract] |
Income Tax Expense (Benefit) | The income tax provision is comprised of the following:
|  | Year Ended December 31, 2018 |  |  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
Current: |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | — |
State |  |  | (3 | ) |  |  | (3 | ) |  |  | (133 | )
Foreign |  |  | — |  |  |  | — |  |  |  | — |
|  |  | (3 | ) |  |  | (3 | ) |  |  | (133 | )
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | — |  |  |  | — |  |  |  | — |
State |  |  | — |  |  |  | — |  |  |  | — |
Total income tax provision |  | $ | (3 | ) |  | $ | (3 | ) |  | $ | (133 | )
Effective Income Tax Rate Reconciliation | A reconciliation of the United States federal statutory income tax rate to our effective income tax rate is as follows:
|  | Year Ended December 31, 2018 |  |  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
United States federal statutory rate |  |  | 21.00 | % |  |  | 35.00 | % |  |  | 35.00 | %
State taxes, net of federal benefit |  |  | (0.01 | )% |  |  | (0.01 | )% |  |  | (0.31 | )%
Valuation allowance |  |  | (24.33 | )% |  |  | (35.94 | )% |  |  | (35.43 | )%
Accounting method change - ASC 606 |  |  | 2.07 | % |  |  | — |  |  |  | — |
R&D Credit |  |  | 1.53 | % |  |  | 1.43 | % |  |  | 0.66 | %
Other |  |  | (0.27 | )% |  |  | (0.50 | )% |  |  | (0.39 | )%
Effective income tax rate |  |  | (0.01 | )% |  |  | (0.02 | )% |  |  | (0.47 | )%
Deferred Tax Assets and Liabilities | Deferred tax assets (liabilities) consist of the following:
|  | Year Ended December 31, 2018 |  |  | Year Ended December 31, 2017 |
Deferred tax assets: |  |  |  |  |  |
Reserves and accruals |  | $ | 45 |  |  | $ | 963 |
Research and development credits and other credits |  |  | 1,635 |  |  |  | 1,300 |
Net operating loss carry forward |  |  | 25,733 |  |  |  | 22,448 |
Stock based compensation |  |  | 8,857 |  |  |  | 9,260 |
Other |  |  | 26 |  |  |  | 54 |
Total deferred tax assets |  |  | 36,296 |  |  |  | 34,025 |
Valuation allowance |  |  | (36,296 | ) |  |  | (34,025 | )
Deferred tax assets after valuation allowance |  |  | — |  |  |  | — |
Deferred tax liability: |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | — |  |  |  | — |
Total deferred tax liability |  |  | — |  |  |  | — |
Net deferred tax assets |  | $ | — |  |  | $ | — |
Unrecognized Tax Benefits Reconciliation | A reconciliation of beginning and ending amounts of unrecognized tax benefits follows:
|  | Year Ended December 31, 2018 |  |  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
Balance at the beginning of the year |  | $ | 316 |  |  | $ | 316 |  |  | $ | 316 |
Additions based on tax positions related to the current year |  |  | — |  |  |  | — |  |  |  | — |
Additions for tax positions of prior years |  |  | — |  |  |  | — |  |  |  | — |
Settlements |  |  | — |  |  |  | — |  |  |  | — |
Lapse of applicable statute of limitations |  |  | — |  |  |  | — |  |  |  | — |
Balance at the end of the year |  | $ | 316 |  |  | $ | 316 |  |  | $ | 316 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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