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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Components of Income/(Loss) Before Income Tax Provision (Benefit) | The components of income/(loss) from continuing operations before income tax provision (benefit) as of December 31, 2020 and 2019 are as follows (in thousands):
|  | 2020 |  |  | 2019 |
U.S. |  | $ | (8,241 | ) |  | $ | (3,439 | )
Foreign |  |  | — |  |  |  | 403 |
|  | $ | (8,241 | ) |  | $ | (3,036 | )
Reconciliation of Total Income Tax Provision | A reconciliation of the total income tax provision tax rate to the statutory federal income tax rates of 21% for the years ended December 31, 2020 and 2019, respectively, is as follows:
|  | 2020 |  |  | 2019 |
Income tax expense (benefit) at federal statutory rate |  |  | (21.0 | )% |  |  | (21.0 | )%
Change in valuation allowance |  |  | 23.6 | % |  |  | 23.0 | %
Income tax expense (benefit) at state statutory rate |  |  | (8.9 | )% |  |  | (12.2 | )%
Stock compensation |  |  | 6.9 | % |  |  | 13.7 | %
Mark to market adjustment |  |  | (6.1 | )% |  |  | (24.0 | )%
NOLs expiring and adjustments to NOL |  |  | 6.0 | % |  |  | 19.2 | %
Research credit |  |  | (1.1 | )% |  |  | (1.8 | )%
Return to provision |  |  | 1.0 | % |  |  | 3.1 | %
Change in state rate |  |  | (0.5 | )% |  |  | (1.3 | )%
Permanent interest adjustments |  |  | — |  |  |  | 1.1 | %
Other, net |  |  | 0.1 | % |  |  | 0.2 | %
|  |  | 0.0 | % |  |  | 0.0 | %
Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant portions of our deferred tax assets and deferred tax liabilities as of December 31, 2020 and 2019 are as follows (in thousands):
|  | 2020 |  |  | 2019 |
Deferred tax assets: |  |  |  |  |  |  |  |
Allowances and reserves |  | $ | — |  |  | $ | 6 |
Accrued expenses |  |  | 128 |  |  |  | 283 |
Stock based compensation |  |  | 168 |  |  |  | 657 |
Net operating loss carryforwards |  |  | 95,114 |  |  |  | 92,659 |
Income tax credit carryforwards |  |  | 8,756 |  |  |  | 8,749 |
Property and equipment, principally due to differences in depreciation |  |  | 16 |  |  |  | 95 |
Intangible assets |  |  | 556 |  |  |  | 370 |
Other, net |  |  | 182 |  |  |  | 217 |
|  |  | 104,920 |  |  |  | 103,036 |
Valuation allowance |  |  | (104,742 | ) |  |  | (102,822 | )
Total deferred tax assets, net of allowance |  |  | 178 |  |  |  | 214 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Other |  |  | (178 | ) |  |  | (214 | )
Total deferred tax liability |  |  | (178 | ) |  |  | (214 | )
Net deferred tax assets (liability) |  | $ | — |  |  | $ | — |
Unrecognized Tax Benefits Activity | Following is a tabular reconciliation of the unrecognized tax benefits activity during the years ended December 31, 2020 and 2019 (in thousands):
|  | 2020 |  |  | 2019 |
Unrecognized Tax Benefits – Beginning |  | $ | 2,234 |  |  | $ | 2,216 |
Gross decreases – tax positions in prior period |  |  | (44 | ) |  |  | (18 | )
Gross increase – current-period tax positions |  |  | 33 |  |  |  | 36 |
Unrecognized Tax Benefits – Ending |  | $ | 2,223 |  |  | $ | 2,234 |

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