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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Components of Loss before Income Taxes | The following table presents components of loss before income taxes for the periods presented (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
United States |  | $ | (9,434 | ) |  | $ | (12,222 | ) |  | $ | (26,305 | )
International |  | 733 |  |  | 416 |  |  | 528 |
Loss before income taxes |  | $ | (8,701 | ) |  | $ | (11,806 | ) |  | $ | (25,777 | )
Schedule of Components of Provision for Income Taxes | Provision for income taxes for the periods presented consisted of (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |  |
U.S. federal |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. state |  | 42 |  |  | 16 |  |  | 21 |
Foreign |  | 226 |  |  | 38 |  |  | 40 |
Total provision for income taxes |  | $ | 268 |  |  | $ | 54 |  |  | $ | 61 |
Schedule of Effective Income Tax Amount Reconciliation | Income tax expense differed from the amounts computed by applying the U.S. federal income tax rate of 34% to pre-tax loss for the periods presented as a result of the following (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
U.S. federal tax at statutory rate |  | $ | (2,958 | ) |  | $ | (4,014 | ) |  | $ | (8,764 | )
U.S. state income taxes |  | (708 | ) |  | 490 |  |  | (756 | )
Non-deductible expense (benefit) |  | (5,673 | ) |  | 931 |  |  | 438 |
Research and development credit |  | (402 | ) |  | (262 | ) |  | (440 | )
Stock-based compensation |  | (14,622 | ) |  | 983 |  |  | 737 |
Impact of 2017 Tax Act |  | 25,952 |  |  | — |  |  | — |
Other |  | 2 |  |  | (104 | ) |  | 481 |
Change in valuation allowance |  | (1,323 | ) |  | 2,030 |  |  | 8,365 |
Total provision for income taxes |  | $ | 268 |  |  | $ | 54 |  |  | $ | 61 |
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities as of December 31, 2017 and 2016 related to the following (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Deferred tax assets: |  |  |  |
Net operating loss and credit carryforwards |  | $ | 47,991 |  |  | $ | 48,533 |
Accrued liabilities |  | 3,183 |  |  | 3,801 |
Allowance for doubtful accounts |  | 416 |  |  | 429 |
Property and equipment |  | (98 | ) |  | 183 |
Deferred revenue |  | 140 |  |  | 23 |
Accrued compensation |  | 900 |  |  | 1,183 |
Intangibles |  | 7 |  |  | 14 |
Gross deferred tax assets |  | 52,539 |  |  | 54,166 |
Valuation allowance |  | (52,275 | ) |  | (53,598 | )
Net deferred tax assets |  | 264 |  |  | 568 |
Deferred tax liabilities: |  |  |  |
Amortized intangibles |  | (264 | ) |  | (568 | )
Gross deferred tax liabilities |  | (264 | ) |  | (568 | )
Net deferred taxes |  | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Rollforward | The table below shows the changes in the gross amount of unrecognized tax benefits for the periods presented (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Unrecognized benefit — beginning of period |  | $ | 2,805 |  |  | $ | 2,485 |  |  | $ | 1,975 |
Gross increases — current year tax positions |  | 310 |  |  | 324 |  |  | 522 |
Gross decreases — prior year tax positions |  | — |  |  | (4 | ) |  | (12 | )
Unrecognized benefit — end of period |  | $ | 3,115 |  |  | $ | 2,805 |  |  | $ | 2,485 |

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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://www.xbrl.org/2003/role/presentationRef -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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