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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Schedule of components of income tax expense (benefit) | The components of the provision for income taxes are presented in the following table:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Current: |  |  |  |  |
Federal | $ | — |  |  | $ | — |  |  | $ | — |
State | — |  |  | 2,000 |  |  | (1,000 | )
| — |  |  | 2,000 |  |  | (1,000 | )
Deferred: |  |  |  |  |
Federal | (1,594,000 | ) |  | 18,000 |  |  | 15,000 |
State | (504,000 | ) |  | 9,000 |  |  | 17,000 |
| (2,098,000 | ) |  | 27,000 |  |  | 32,000 |
| $ | (2,098,000 | ) |  | $ | 29,000 |  |  | $ | 31,000 |
Schedule of effective income tax rate reconciliation | The reconciliation of income taxes attributable to continuing operations computed at the statutory tax rates to income tax expense (recovery), using a 35% statutory tax rate, is:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Income (benefit) taxes at statutory rates | $ | (10,920,000 | ) |  | $ | (12,639,000 | ) |  | $ | (23,118,000 | )
State income tax, net of federal benefit | (2,640,000 | ) |  | (2,362,000 | ) |  | (1,651,000 | )
Change in valuation allowance | 7,882,000 |  |  | 14,235,000 |  |  | 8,819,000 |
Research and development tax credits | (1,537,000 | ) |  | (849,000 | ) |  | (1,230,000 | )
Fair value warrant | (253,000 | ) |  | (180,000 | ) |  | 16,129,000 |
Stock compensation | 2,288,000 |  |  | 1,573,000 |  |  | 279,000 |
Uncertain tax positions | 1,968,000 |  |  | 340,000 |  |  | 495,000 |
Expired NOL's and credits | 339,000 |  |  | 728,000 |  |  | 338,000 |
Limited NOL's and credits | (297,000 | ) |  | (749,000 | ) |  | 605,000 |
Change in state tax rate | 676,000 |  |  | (60,000 | ) |  | (623,000 | )
Other | 396,000 |  |  | (8,000 | ) |  | (12,000 | )
| $ | (2,098,000 | ) |  | $ | 29,000 |  |  | $ | 31,000 |
Schedule of deferred tax assets and liabilities | Significant components of the Company’s deferred tax assets and liabilities as of December 31, 2015 and 2014 are shown below:
| As of December 31,
| 2015 |  | 2014
Deferred tax assets: |  |  |
Capitalized research expense | $ | 1,201,000 |  |  | $ | 2,059,000 |
Net operating loss carryforwards | 71,848,000 |  |  | 64,354,000 |
Research and development and other tax credits | 3,339,000 |  |  | 2,417,000 |
Deferred revenue | 5,213,000 |  |  | 1,828,000 |
Deferred rent | 2,171,000 |  |  | 1,878,000 |
Stock-based compensation | 2,135,000 |  |  | 2,704,000 |
Other | 3,457,000 |  |  | 3,251,000 |
| 89,364,000 |  |  | 78,491,000 |
Valuation allowance | (83,245,000 | ) |  | (75,363,000 | )
Total deferred tax assets | 6,119,000 |  |  | 3,128,000 |
Deferred tax liabilities: |  |  |
Acquired intangibles | (596,000 | ) |  | (804,000 | )
Investment in affiliated entity | (4,399,000 | ) |  | (1,315,000 | )
Fixed assets | (1,299,000 | ) |  | (1,170,000 | )
Net deferred tax liabilities | $ | (175,000 | ) |  | $ | (161,000 | )
Summary of Operating Loss Carryforwards | The California net operating loss carry forwards will expire as follows:
| Amount (in millions)
2016 | $ | 1.1 |
2017 | 0.5 |
2028 and beyond | 54.9 |
Total | $ | 56.5 |
Schedule of unrecognized tax benefits rollforward | The following table summarizes the activity related to our unrecognized tax benefits:
| Year ended December 31,
| 2015 |  | 2014 |  | 2013
Balance at beginning of the year | $ | 2,759,000 |  |  | $ | 2,416,000 |  |  | $ | 1,896,000 |
Increases related to current year tax positions | 615,000 |  |  | 331,000 |  |  | 305,000 |
Increases related to prior year tax positions | 2,081,000 |  |  | 12,000 |  |  | 215,000 |
Balance at end of the year | $ | 5,455,000 |  |  | $ | 2,759,000 |  |  | $ | 2,416,000 |

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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=6907707&loc=d3e32639-109319 + Details
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