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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Components of Income/(Loss) Before Income Tax Provision (Benefit) | The components of income/(loss) before income tax provision (benefit) as of December 31, 2017 and 2016 are as follows (in thousands):
|  | 2017 |  |  | 2016
U.S. | $ | (21,915) |  | $ | (20,387)
Foreign |  | (771) |  |  | (1,659)
| $ | (22,686) |  | $ | (22,046)
Reconciliation of Total Income Tax Provision | A reconciliation of the total income tax provision tax rate to the statutory federal income tax rate of 34% for the years ended December 31, 2017 and 2016 is as follows:
|  | 2017 |  |  | 2016 |
Income tax expense (benefit) at federal statutory rate |  |  | (34.0 | )% |  |  | (34.0 | )%
Income tax expense (benefit) at state statutory rate |  |  | (3.9 | )% |  |  | (3.4 | )%
Change in valuation allowance |  |  | (172.4 | )% |  |  | 16.8 | %
Change in state rate |  |  | (0.8 | )% |  |  | (0.1 | )%
Permanent interest adjustments |  |  | 0.2 | % |  |  | 0.2 | %
Stock compensation |  |  | 3.0 | % |  |  | 12.7 | %
Research credit |  |  | (1.1 | )% |  |  | (1.4 | )%
Foreign rate differential |  |  | 202.1 | % |  |  | 0.8 | %
NOLs expiring and adjustments to NOL |  |  | 7.0 | % |  |  | 6.0 | %
Other, net |  |  | (0.2 | )% |  |  | 2.5 | %
|  |  | (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, 2017 and 2016 are as follows (in thousands):
|  | 2017 |  |  | 2016 |
Deferred tax assets: |  |  |  |  |  |  |  |
Allowances and reserves |  | $ | 140 |  |  | $ | 573 |
Accrued expenses |  |  | 154 |  |  |  | 701 |
Stock based compensation |  |  | 1,065 |  |  |  | 1,947 |
Net operating loss carryforwards |  |  | 87,426 |  |  |  | 125,182 |
Income tax credit carryforwards |  |  | 8,587 |  |  |  | 7,764 |
Property and equipment, principally due to differences in depreciation |  |  | 514 |  |  |  | 675 |
Other, net |  |  | 45 |  |  |  | 48 |
|  |  | 97,931 |  |  |  | 136,890 |
Valuation allowance |  |  | (97,089 | ) |  |  | (134,873 | )
Total deferred tax assets, net of allowance |  |  | 842 |  |  |  | 2,017 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Intangibles assets |  |  | (842 | ) |  |  | (2,017 | )
Total deferred tax liability |  |  | (842 | ) |  |  | (2,017 | )
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, 2017 and 2016 (in thousands):
|  | 2017 |  |  | 2016 |
Unrecognized Tax Benefits – Beginning |  | $ | 2,062 |  |  | $ | 1,987 |
Gross increases – tax positions in prior period |  |  | — |  |  |  | 1 |
Gross decreases – tax positions in prior period |  |  | — |  |  |  | (13 | )
Gross increase – current-period tax positions |  |  | 95 |  |  |  | 87 |
Unrecognized Tax Benefits – Ending |  | $ | 2,157 |  |  | $ | 2,062 |

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