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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Provision (Benefit) | The income tax provision (benefit) consisted of the following (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Current portion: |  |  |  |  |  |  |  |  |  |  |  |
State |  | $ | 2 |  |  | $ | 3 |  |  | $ | 3 |
Foreign |  |  | 11 |  |  |  | 7 |  |  |  | 42 |
|  |  | 13 |  |  |  | 10 |  |  |  | 45 |
Deferred portion: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | — |  |  |  | (243 | ) |  |  | — |
|  | $ | 13 |  |  | $ | (233 | ) |  | $ | 45 |
Significant Components of Deferred Tax Assets and Liabilities | Significant components of the Company’s deferred tax assets and liabilities were (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
Federal and state loss carryforwards |  | $ | 681 |  |  | $ | 49,533 |
Reserves, accruals and other |  |  | 230 |  |  |  | 391 |
Depreciation and amortization |  |  | 1,901 |  |  |  | 1,100 |
Deferred stock-based compensation |  |  | 2,571 |  |  |  | 2,483 |
Research and development credit carryforwards |  |  | 6,537 |  |  |  | 15,487 |
Foreign tax and other credits |  |  | 242 |  |  |  | 513 |
Total deferred tax assets |  |  | 12,162 |  |  |  | 69,507 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Acquired intangible assets and other |  |  | — |  |  |  | 408 |
Less: Valuation allowance |  |  | (11,920 | ) |  |  | (68,857 | )
Net deferred tax assets |  | $ | 242 |  |  | $ | 242 |
Reconciliation of Income taxes Provided at Federal Statutory Rate to Actual Income Tax Provision (Benefit) | A reconciliation of income taxes provided at the federal statutory rate (21% for 2018 and 35% for each of 2017 and 2016) to the actual income tax provision is as follows (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Income tax benefit computed at U.S. statutory rate |  | $ | (2,393 | ) |  | $ | (3,815 | ) |  | $ | (11,229 | )
State income tax (net of federal benefit) |  |  | 2 |  |  |  | 3 |  |  |  | 3 |
Foreign income tax at rate different from U.S. statutory rate |  |  | 12 |  |  |  | 3 |  |  |  | (7 | )
Research and development credits |  |  | (194 | ) |  |  | (480 | ) |  |  | (981 | )
Stock-based compensation |  |  | — |  |  |  | (40 | ) |  |  | 75 |
Amortization of intangible assets |  |  | (60 | ) |  |  | (100 | ) |  |  | (100 | )
Goodwill impairment |  |  | 1,482 |  |  |  | — |  |  |  | 1,856 |
Federal tax rate reduction |  |  | — |  |  |  | (26,617 | ) |  |  | — |
Valuation allowance changes affecting tax provision |  |  | 1,158 |  |  |  | 30,811 |  |  |  | 10,022 |
Other |  |  | 6 |  |  |  | 2 |  |  |  | 406 |
Income tax (benefit) provision |  | $ | 13 |  |  | $ | (233 | ) |  | $ | 45 |
Schedule of Domestic and Foreign Components of Loss Before Income Tax Provision | The domestic and foreign components of loss before income tax provision were (in thousands):
|  | Year Ended |
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
U.S. |  | $ | (11,353 | ) |  | $ | (11,063 | ) |  | $ | (31,115 | )
Non-U.S. |  |  | (43 | ) |  |  | 162 |  |  |  | (888 | )
|  | $ | (11,396 | ) |  | $ | (10,901 | ) |  | $ | (32,003 | )

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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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