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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes [Abstract] |
Components of Deferred Tax Assets and Liabilities | The primary components of the deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows (in thousands):
|  | 2017 |  |  | 2016 |
Deferred liabilities: |  |  |  |  |  |
Available-for-sale securities |  | $ | - |  |  | $ | (761 | )
Total deferred tax liabilities |  |  | - |  |  |  | (761 | )
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 11,414 |  |  |  | 11,730 |
Research and development credit carryforwards |  |  | 2,141 |  |  |  | 1,765 |
Patents and fixed assets |  |  | 268 |  |  |  | 179 |
Stock-based compensation and accrued payroll |  |  | 1,260 |  |  |  | 1,041 |
Valuation Allowance |  |  | (15,083 | ) |  |  | (13,954 | )
Total deferred tax assets |  |  | - |  |  |  | 761 |
Net deferred tax asset (liability) |  | $ | - |  |  | $ | - |
Income Tax Reconciliation | Income taxes differed from the amounts computed by applying the U.S. federal income tax of 34% to pretax losses from operations as a result of the following:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Computed tax benefit at federal statutory rate |  |  | 34 | % |  |  |  | 34 | % |  |  |  | 34 | % |
Re-rate of federal net deferred tax assets |  |  | (35) | % |  |  |  | 0 | % |  |  |  | 0 | % |
Permanent differences |  |  | (8) | % |  |  |  | (1) | % |  |  |  | (9) | % |
State tax benefit |  |  | 3 | % |  |  |  | 2 | % |  |  |  | 15 | % |
Research and development credits |  |  | 1 | % |  |  |  | 2 | % |  |  |  | 2 | % |
Other |  |  | 0 | % |  |  |  | 7 | % |  |  |  | 3 | % |
Adjusted basis for available-for-sale-securities |  |  | 11 | % |  |  |  | 0 | % |  |  |  | 0 | % |
Change in valuation allowance |  |  | (6) | % |  |  |  | (44) | % |  |  |  | (45) | % |
|  |  | - | % |  |  |  | - | % |  |  |  | - | % |

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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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