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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Tax Disclosure [Abstract] |
Significant Components of Company's Deferred Taxes | Significant components of the Company’s deferred taxes at December 31, 2014 and 2013 are as follows:
|  | 2014 |  |  | 2013 |
Net operating loss carryforwards |  | $ | 29,442 |  |  | $ | 25,696 |
Research and development credit carryforwards |  |  | 1,715 |  |  |  | 1,525 |
Capitalized costs |  |  | 3,503 |  |  |  | 3,067 |
Capitalized research and development costs |  |  | 9,938 |  |  |  | 6,992 |
Other |  |  | 422 |  |  |  | 220 |
Total deferred tax assets |  |  | 45,020 |  |  |  | 37,500 |
Valuation allowance |  |  | (45,020 | ) |  |  | (37,500 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Reconciliation of Income Tax Expense Computed at Statutory Federal Income Tax Rate to Income Taxes | A reconciliation of income tax expense computed at the statutory federal income tax rate to income taxes as reflected in the financial statements is as follows:
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |
Federal income tax expense at statutory rate |  |  | 34.0 | % |  |  | 34.0 | %
State income tax, net of federal benefit |  |  | 4.5 | % |  |  | 5.0 | %
Permanent differences |  |  | (3.7 | %) |  |  | 0.2 | %
Research and development credit |  |  | 0.8 | % |  |  | 1.4 | %
Stock compensation |  |  | (0.9 | %) |  |  | (1.1 | %)
Expiration of state net operating loss |  |  | (1.7 | %) |  |  | (4.2 | %)
Other |  |  | (0.8 | %) |  |  | 0.2 | %
Change in valuation allowance |  |  | (32.2 | %) |  |  | (35.5 | %)
Effective income tax rate |  |  | 0.0 | % |  |  | 0.0 | %

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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