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INCOME TAXES | 12 Months Ended
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Dec. 31, 2014
INCOME TAXES |
INCOME TAXES | 11. 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 are as follows:
|  | December 31, |
|  | 2014 |  | 2013 |
|  | (In thousands) |
Net operating loss carryforwards |  | $ | 281,300 |  | $ | 271,800 |
Purchased technology |  |  | — |  |  | 6,300 |
Research credits |  |  | 23,400 |  |  | 22,700 |
Capitalized research and development |  |  | 2,100 |  |  | 6,600 |
License fees |  |  | 500 |  |  | 700 |
Other—net |  |  | 7,600 |  |  | 10,100 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax assets |  |  | 314,900 |  |  | 318,200 |
Valuation allowance for deferred tax assets |  |  | (314,900 | ) |  | (318,200 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax assets |  | $ | — |  | $ | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
We record net deferred tax assets to the extent we believe these assets will more likely than not be realized. In making such determination, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial performance. Forming a conclusion that a valuation allowance is not required is difficult when there is negative evidence such as cumulative losses in recent years. Because of our history of losses, the net deferred tax assets have been fully offset by a valuation allowance. The valuation allowance decreased by $3,300,000 and $5,500,000 during the years ended December 31, 2014 and 2013, respectively, and increased by $14,200,000 during the year ended December 31, 2012. Approximately $4,900,000 of the valuation allowance for deferred tax assets relates to benefits of stock option deductions which, when recognized, will be allocated directly to contributed capital. As of December 31, 2014, we had domestic federal net operating loss carryforwards of approximately $774,000,000 expiring at various dates beginning in 2018 through 2034, and state net operating loss carryforwards of approximately $395,000,000 expiring at various dates beginning in 2015 through 2034, if not utilized. We also had federal research and development tax credit carryforwards of approximately $14,900,000 expiring at various dates beginning in 2018 through 2034, if not utilized. Our state research and development tax credit carryforwards of approximately $13,000,000 carry forward indefinitely. Due to the change of ownership provisions of the Tax Reform Act of 1986, utilization of a portion of our domestic net operating loss and tax credit carryforwards may be limited in future periods. Further, a portion of the carryforwards may expire before being applied to reduce future income tax liabilities. We adopted the provision of the standard for accounting for uncertainties in income taxes on January 1, 2007. Upon adoption, we recognized no material adjustment in the liability for unrecognized tax benefits. At December 31, 2014, we had approximately $17,100,000 of unrecognized tax benefits, none of which would currently affect our effective tax rate if recognized due to our deferred tax assets being fully offset by a valuation allowance. A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows (in thousands):
Balance as of December 31, 2013 |  | $ | 11,600 |
Increase related to prior year tax positions |  |  | 5,100 |
Increase related to current year tax positions |  |  | 400 |
Settlements |  |  | — |
Reductions due to lapse of applicable statute of limitations |  |  | — |
​ | ​ | ​ | ​ | ​
Balance as of December 31, 2014 |  | $ | 17,100 |
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If applicable, we would classify interest and penalties related to uncertain tax positions in income tax expense. Through December 31, 2014, there has been no interest expense or penalties related to unrecognized tax benefits. We do not currently expect any significant changes to unrecognized tax benefits during the fiscal year ended December 31, 2015. In certain cases, our uncertain tax positions are related to tax years that remain subject to examination by the relevant tax authorities. Tax years for which we have carryforward net operating loss and credit attributes remain subject to examination by federal and most state tax authorities.

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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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