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Income Taxes | 12 Months Ended
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Dec. 31, 2014
Income Taxes |
Income Taxes | 8. Income Taxes Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets (liabilities) as of December 31, 2014 and 2013 are as follows (in thousands):
|  | December 31 |
|  | 2014 |  | 2013 |
Net operating loss carryforwards |  | $ | 32,103 |  | $ | 32,253 |
Net operating loss carryforwards of foreign subsidiaries |  | 374 |  | 374 |
Book over tax depreciation |  | (54 | ) | (43 | )
Stock-based compensation expense |  | 10 |  | 577 |
Other |  | 125 |  | 116 |
Deferred tax assets |  | 32,558 |  | 33,277 |
Valuation allowance for deferred tax assets |  | (32,558 | ) | (33,277 | )
Deferred tax assets, net of allowance |  | $ | — |  | $ | — |
Deferred tax assets are required to be reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Realization of the future benefits related to the deferred tax assets is dependent on many factors, including the Company’s ability to generate taxable income within the near to medium term. Management has considered these factors in determining the valuation allowance for 2014 and 2013. The differences between the provision for income taxes and income taxes computed using the federal statutory rate for the years ended December 31, 2014 and 2013 are as follows (in thousands):
|  | 2014 |  | 2013 |
Reconciliation of income tax benefit to statutory rate: |  |  |  |  |
Income tax (benefit) at statutory rate |  | $ | (93 | ) | $ | 212 |
State income taxes, net of federal income tax benefit |  | 49 |  | 4 |
RTP (ISO expense) |  | 508 |  | — |
Permanent differences |  | 13 |  | 8 |
True-up prior year NOL |  | — |  | (8 | )
Change in valuation allowance |  | (718 | ) | 2,405 |
Change in state tax rate |  | 241 |  | (2,605 | )
Other |  | — |  | (16 | )
|  | $ | — |  | $ | — |
At December 31, 2014, we had federal net operating loss carryforwards of approximately $85.9 million for income tax purposes that begin to expire in 2021 and are subject to the ownership change limitations under Internal Revenue Code Section 382. We also have approximately $6 million of state net operating loss carryforwards that begin to expire in 2017.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: 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 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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