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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income tax benefit attributable to our loss from operations | Income tax benefit attributable to our loss from operations before income taxes differs from the amounts computed by applying the U.S. federal statutory income tax rate of 35%, as a result of the following (in thousands):
|  | Years ended December 31, |
|  | 2013 |  |  | 2012 |
U.S. federal income tax benefit at statutory rates |  |  | (2,429 | ) |  | $ | (1,512 | )
State income tax benefit, net of federal benefit |  |  | (209 | ) |  |  | (130 | )
Research and experimentation credits |  |  | (133 | ) |  |  | — |
Other |  |  | 184 |  |  |  | 196 |
Change in valuation allowance |  |  | 2,587 |  |  |  | 1,446 |
|  | $ | — |  |  | $ | — |
Net deferred tax assets | Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting and the amounts used for income tax purposes, as well as operating loss and Tax credit carryforwards. The income tax effects of temporary differences and carryforwards that give rise to significant portions of the Company’s net deferred tax assets consisted of the following (in thousands):
|  | As of December 31, |
|  | 2013 |  |  | 2012 |
Deferred tax assets: |  |  |  |  |  |  |  |
Current deferred tax assets: |  |  |  |  |  |  |  |
Vacation accrual |  | $ | 27 |  |  | $ | 26 |
Total current deferred tax assets |  |  | 27 |  |  |  | 26 |
Valuation allowance |  |  | (27 | ) |  |  | (26 | )
Net current deferred tax assets |  | $ | — |  |  | $ | — |
Noncurrent deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 39,799 |  |  | $ | 37,295 |
Charitable contribution carryforwards |  |  | 371 |  |  |  | 368 |
Research and experimentation credits |  |  | 820 |  |  |  | 687 |
Capitalized intangibles |  |  | 3,351 |  |  |  | 3,413 |
Stock based compensation |  |  | 454 |  |  |  | 416 |
Depreciation and amortization |  |  | 5 |  |  |  | 11 |
Other |  |  | — |  |  |  | 25 |
Total noncurrent deferred tax assets |  |  | 44,800 |  |  |  | 42,215 |
Valuation allowance |  |  | (44,800 | ) |  |  | (42,215 | )
Net noncurrent deferred tax assets |  | $ | — |  |  | $ | — |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Current deferred tax liabilities |  | $ | — |  |  | $ | — |
Noncurrent deferred tax liabilities |  |  | — |  |  |  | — |
Net deferred tax liabilities |  | $ | — |  |  | $ | — |
Net noncurrent deferred tax assets |  | $ | — |  |  | $ | — |

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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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